diff --git a/Makefile b/Makefile
index c7b72405..c0d5f6ef 100644
--- a/Makefile
+++ b/Makefile
@@ -30,8 +30,8 @@ OBJS = swad_account.o swad_action.o swad_agenda.o swad_alert.o \
        swad_announcement.o swad_API.o swad_assignment.o swad_attendance.o \
        swad_banner.o swad_box.o swad_button.o \
        swad_calendar.o swad_centre.o swad_chat.o swad_classroom.o \
-       swad_config.o swad_connected.o swad_cookie.o swad_country.o \
-       swad_course.o swad_cryptography.o \
+       swad_config.o swad_config_course.o swad_connected.o swad_cookie.o \
+       swad_country.o swad_course.o swad_cryptography.o \
        swad_database.o swad_date.o swad_degree.o swad_degree_type.o \
        swad_department.o swad_duplicate.o \
        swad_enrolment.o swad_exam.o \
diff --git a/swad_API.c b/swad_API.c
index 5c6cc20c..31df8249 100644
--- a/swad_API.c
+++ b/swad_API.c
@@ -93,10 +93,10 @@ cp -f /home/acanas/swad/swad/swad /var/www/cgi-bin/
 
 #include <dirent.h>		// For scandir, etc.
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
-#include <sys/stat.h>		// For lstat
+#include <stddef.h>		// For NULL
 #include <string.h>
 #include <stdsoap2.h>
+#include <sys/stat.h>		// For lstat
 
 #include "soap/soapH.h"		// gSOAP header
 #include "soap/swad.nsmap"	// Namespaces map used
diff --git a/swad_RSS.c b/swad_RSS.c
index c73d6e26..2181dc00 100644
--- a/swad_RSS.c
+++ b/swad_RSS.c
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <string.h>
 
 #include "swad_changelog.h"
diff --git a/swad_action.c b/swad_action.c
index 5500b897..44872c3b 100644
--- a/swad_action.c
+++ b/swad_action.c
@@ -25,7 +25,7 @@
 /*********************************** Headers *********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For fprintf
 #include <string.h>		// For string functions
 
@@ -1909,12 +1909,12 @@ const struct Act_Actions Act_Actions[Act_NUM_ACTIONS] =
    [ActSeeCrsTT		] = {  25, 6,TabCrs,ActSeeCrsTT		,0x3F8,0x3C7,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,NULL				,TT_ShowClassTimeTable		,"clock"		},
 
    // Actions not in menu:
-   [ActPrnCrsInf	] = {1028,-1,TabUnk,ActSeeCrsInf	,0x3F8,0x3C7,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_NEW_TAB,NULL				,Crs_PrintConfiguration		,NULL},
-   [ActChgCrsDegCfg	] = {1587,-1,TabUnk,ActSeeCrsInf	,0x380,0x380,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_ChangeCrsDegInConfig	,Crs_ContEditAfterChgCrsInConfig,NULL},
-   [ActRenCrsShoCfg	] = {1601,-1,TabUnk,ActSeeCrsInf	,0x3C0,0x3C0,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_RenameCourseShortInConfig	,Crs_ContEditAfterChgCrsInConfig,NULL},
-   [ActRenCrsFulCfg	] = {1600,-1,TabUnk,ActSeeCrsInf	,0x3C0,0x3C0,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_RenameCourseFullInConfig	,Crs_ContEditAfterChgCrsInConfig,NULL},
-   [ActChgInsCrsCodCfg	] = {1024,-1,TabUnk,ActSeeCrsInf	,0x220,0x200,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_ChangeInsCrsCodInConfig	,Crs_ContEditAfterChgCrsInConfig,NULL},
-   [ActChgCrsYeaCfg	] = {1573,-1,TabUnk,ActSeeCrsInf	,0x220,0x200,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_ChangeCrsYearInConfig	,Crs_ContEditAfterChgCrsInConfig,NULL},
+   [ActPrnCrsInf	] = {1028,-1,TabUnk,ActSeeCrsInf	,0x3F8,0x3C7,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_NEW_TAB,NULL				,CfgCrs_PrintConfiguration		,NULL},
+   [ActChgCrsDegCfg	] = {1587,-1,TabUnk,ActSeeCrsInf	,0x380,0x380,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_ChangeCrsDegInConfig	,CfgCrs_ContEditAfterChgCrsInConfig,NULL},
+   [ActRenCrsShoCfg	] = {1601,-1,TabUnk,ActSeeCrsInf	,0x3C0,0x3C0,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_RenameCourseShortInConfig	,CfgCrs_ContEditAfterChgCrsInConfig,NULL},
+   [ActRenCrsFulCfg	] = {1600,-1,TabUnk,ActSeeCrsInf	,0x3C0,0x3C0,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_RenameCourseFullInConfig	,CfgCrs_ContEditAfterChgCrsInConfig,NULL},
+   [ActChgInsCrsCodCfg	] = {1024,-1,TabUnk,ActSeeCrsInf	,0x220,0x200,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_ChangeInsCrsCodInConfig	,CfgCrs_ContEditAfterChgCrsInConfig,NULL},
+   [ActChgCrsYeaCfg	] = {1573,-1,TabUnk,ActSeeCrsInf	,0x220,0x200,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,Crs_ChangeCrsYearInConfig	,CfgCrs_ContEditAfterChgCrsInConfig,NULL},
    [ActEdiCrsInf	] = { 848,-1,TabUnk,ActSeeCrsInf	,0x220,0x200,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,NULL				,Inf_FormsToSelSendInfo		,NULL},
 
    [ActEdiTchGui	] = { 785,-1,TabUnk,ActSeeTchGui	,0x220,0x200,    0,    0,    0,    0,    0,Act_CONT_NORM,Act_BRW_1ST_TAB,NULL				,Inf_FormsToSelSendInfo		,NULL},
diff --git a/swad_agenda.c b/swad_agenda.c
index 795276e0..cece2068 100644
--- a/swad_agenda.c
+++ b/swad_agenda.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_alert.c b/swad_alert.c
index 8a0c68b7..fd883ca0 100644
--- a/swad_alert.c
+++ b/swad_alert.c
@@ -26,8 +26,8 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For vasprintf
-#include <linux/stddef.h>	// For NULL
 #include <stdarg.h>		// For va_start, va_end
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For FILE, fprintf, vasprintf
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
diff --git a/swad_assignment.c b/swad_assignment.c
index ca724911..f7e29edf 100644
--- a/swad_assignment.c
+++ b/swad_assignment.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_attendance.c b/swad_attendance.c
index b318d0df..be39784c 100644
--- a/swad_attendance.c
+++ b/swad_attendance.c
@@ -27,8 +27,8 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
 #include <mysql/mysql.h>	// To access MySQL databases
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_banner.c b/swad_banner.c
index bd308179..c4d2fd75 100644
--- a/swad_banner.c
+++ b/swad_banner.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
diff --git a/swad_centre.c b/swad_centre.c
index 59a0d9be..a1435498 100644
--- a/swad_centre.c
+++ b/swad_centre.c
@@ -26,8 +26,8 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
 #include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_changelog.h b/swad_changelog.h
index 86efb937..6d4ad59c 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -492,7 +492,7 @@ enscript -2 --landscape --color --file-align=2 --highlight --line-numbers -o - *
 En OpenSWAD:
 ps2pdf source.ps destination.pdf
 */
-#define Log_PLATFORM_VERSION	"SWAD 19.101.5 (2019-12-28)"
+#define Log_PLATFORM_VERSION	"SWAD 19.102 (2019-12-28)"
 #define CSS_FILE		"swad19.101.5.css"
 #define JS_FILE			"swad19.91.1.js"
 /*
@@ -500,8 +500,9 @@ ps2pdf source.ps destination.pdf
 // TODO: Impedir la creación y edición de proyectos si no son editables.
 // TODO: No se puede entrar con DNI '1' suponiendo que no tenga password ¿por qué?
 
-	Version 19.103:   Dec 28, 2019	Map in country information. (? lines)
-	Version 19.102:   Dec 28, 2019	Map in institution information. (? lines)
+	Version 19.10x:   Dec 28, 2019	Map in country information. (? lines)
+	Version 19.10x:   Dec 28, 2019	Map in institution information. (? lines)
+	Version 19.102:   Dec 29, 2019	New module swad_config_course for course configuration. (249397 lines)
 	Version 19.101.5: Dec 28, 2019	Country information is splitted into two columns. (249330 lines)
 	Version 19.101.4: Dec 28, 2019	Institution information is splitted into two columns. (249324 lines)
 	Version 19.101.3: Dec 28, 2019	Course information is splitted into two columns. (249308 lines)
diff --git a/swad_chat.c b/swad_chat.c
index e203d372..32abf2fa 100644
--- a/swad_chat.c
+++ b/swad_chat.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdbool.h>		// For boolean type
 #include <string.h>
 
diff --git a/swad_classroom.c b/swad_classroom.c
index 32ecd413..a6cdf5f7 100644
--- a/swad_classroom.c
+++ b/swad_classroom.c
@@ -25,8 +25,8 @@
 /********************************** Headers **********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
 #include <malloc.h>		// For calloc, free
+#include <stddef.h>		// For NULL
 #include <string.h>		// For string functions
 
 #include "swad_box.h"
diff --git a/swad_config_course.c b/swad_config_course.c
new file mode 100644
index 00000000..94b6dfc9
--- /dev/null
+++ b/swad_config_course.c
@@ -0,0 +1,468 @@
+// swad_config_course.c: configuration of current course
+
+/*
+    SWAD (Shared Workspace At a Distance),
+    is a web platform developed at the University of Granada (Spain),
+    and used to support university teaching.
+
+    This file is part of SWAD core.
+    Copyright (C) 1999-2019 Antonio Cañas Vargas
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*****************************************************************************/
+/********************************* Headers ***********************************/
+/*****************************************************************************/
+
+#include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
+
+#include "swad_form.h"
+#include "swad_global.h"
+#include "swad_HTML.h"
+#include "swad_logo.h"
+#include "swad_role.h"
+
+/*****************************************************************************/
+/************** External global variables from others modules ****************/
+/*****************************************************************************/
+
+extern struct Globals Gbl;
+
+/*****************************************************************************/
+/*************************** Public constants ********************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Private types *********************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/**************************** Private variables ******************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/**************************** Private prototypes *****************************/
+/*****************************************************************************/
+
+static void CfgCrs_PutIconToPrint (void);
+static void CfgCrs_Title (bool PutLink);
+static void CfgCrs_Degree (bool PrintView,bool PutForm);
+static void CfgCrs_FullName (bool PutForm);
+static void CfgCrs_ShrtName (bool PutForm);
+static void CfgCrs_Year (bool PutForm);
+static void CfgCrs_InstitutionalCode (bool PutForm);
+static void CfgCrs_InternalCode (void);
+static void CfgCrs_Shortcut (bool PrintView);
+static void CfgCrs_QR (void);
+static void CfgCrs_NumUsrsInCrs (Rol_Role_t Role);
+static void CfgCrs_Indicators (void);
+
+/*****************************************************************************/
+/***************** Configuration of the current course ***********************/
+/*****************************************************************************/
+
+void CfgCrs_Configuration (bool PrintView)
+  {
+   extern const char *Hlp_COURSE_Information;
+   bool PutLink;
+   bool PutFormDeg;
+   bool PutFormName;
+   bool PutFormYear;
+   bool PutFormInsCod;
+
+   /***** Trivial check *****/
+   if (Gbl.Hierarchy.Crs.CrsCod <= 0)	// No course selected
+      return;
+
+   /***** Initializations *****/
+   PutLink       = !PrintView && Gbl.Hierarchy.Deg.WWW[0];
+   PutFormDeg    = !PrintView && Gbl.Usrs.Me.Role.Logged >= Rol_CTR_ADM;
+   PutFormName   = !PrintView && Gbl.Usrs.Me.Role.Logged >= Rol_DEG_ADM;
+   PutFormYear   =
+   PutFormInsCod = !PrintView && Gbl.Usrs.Me.Role.Logged >= Rol_TCH;
+
+   /***** Contextual menu *****/
+   if (!PrintView)
+      if (Gbl.Usrs.Me.Role.Logged == Rol_GST ||
+	  Gbl.Usrs.Me.Role.Logged == Rol_USR)
+	{
+         Mnu_ContextMenuBegin ();
+         Enr_PutLinkToRequestSignUp ();	// Request enrolment in the current course
+         Mnu_ContextMenuEnd ();
+	}
+
+   /***** Begin box *****/
+   if (PrintView)
+      Box_BoxBegin (NULL,NULL,NULL,
+		    NULL,Box_NOT_CLOSABLE);
+   else
+      Box_BoxBegin (NULL,NULL,CfgCrs_PutIconToPrint,
+		    Hlp_COURSE_Information,Box_NOT_CLOSABLE);
+
+   /***** Title *****/
+   CfgCrs_Title (PutLink);
+
+   /**************************** Left part ***********************************/
+   HTM_DIV_Begin ("class=\"HIE_CFG_LEFT\"");
+
+   /***** Begin table *****/
+   HTM_TABLE_BeginWidePadding (2);
+
+   /***** Degree *****/
+   CfgCrs_Degree (PrintView,PutFormDeg);
+
+   /***** Course name *****/
+   CfgCrs_FullName (PutFormName);
+   CfgCrs_ShrtName (PutFormName);
+
+   /***** Course year *****/
+   CfgCrs_Year (PutFormYear);
+
+   if (!PrintView)
+     {
+      /***** Institutional code of the course *****/
+      CfgCrs_InstitutionalCode (PutFormInsCod);
+
+      /***** Internal code of the course *****/
+      CfgCrs_InternalCode ();
+     }
+
+   /***** Shortcut to the couse *****/
+   CfgCrs_Shortcut (PrintView);
+
+   if (PrintView)
+      /***** QR code with link to the course *****/
+      CfgCrs_QR ();
+   else
+     {
+      /***** Number of users *****/
+      CfgCrs_NumUsrsInCrs (Rol_TCH);
+      CfgCrs_NumUsrsInCrs (Rol_NET);
+      CfgCrs_NumUsrsInCrs (Rol_STD);
+
+      /***** Indicators *****/
+      CfgCrs_Indicators ();
+     }
+
+   /***** End table *****/
+   HTM_TABLE_End ();
+
+   /***** End of left part *****/
+   HTM_DIV_End ();
+
+   /***** End box *****/
+   Box_BoxEnd ();
+  }
+
+/*****************************************************************************/
+/************* Put icon to print the configuration of a course ***************/
+/*****************************************************************************/
+
+static void CfgCrs_PutIconToPrint (void)
+  {
+   Ico_PutContextualIconToPrint (ActPrnCrsInf,NULL);
+  }
+
+/*****************************************************************************/
+/***************** Print configuration of the current course *****************/
+/*****************************************************************************/
+
+void CfgCrs_PrintConfiguration (void)
+  {
+   CfgCrs_Configuration (true);
+  }
+
+/*****************************************************************************/
+/******************** Show title in course configuration *********************/
+/*****************************************************************************/
+
+static void CfgCrs_Title (bool PutLink)
+  {
+   Hie_ConfigTitle (PutLink,
+		    Hie_DEG,				// Logo scope
+		    Gbl.Hierarchy.Deg.DegCod,		// Logo code
+                    Gbl.Hierarchy.Deg.ShrtName,		// Logo short name
+		    Gbl.Hierarchy.Deg.FullName,		// Logo full name
+		    Gbl.Hierarchy.Deg.WWW,		// Logo www
+		    Gbl.Hierarchy.Crs.FullName);	// Text full name
+  }
+
+/*****************************************************************************/
+/******************** Show degree in course configuration ********************/
+/*****************************************************************************/
+
+static void CfgCrs_Degree (bool PrintView,bool PutForm)
+  {
+   extern const char *Txt_Degree;
+   extern const char *Txt_Go_to_X;
+   unsigned NumDeg;
+
+   /***** Degree *****/
+   HTM_TR_Begin (NULL);
+
+   /* Label */
+   Frm_LabelColumn ("RT",PutForm ? "OthDegCod" :
+	                           NULL,
+		    Txt_Degree);
+
+   /* Data */
+   HTM_TD_Begin ("class=\"DAT LB\"");
+   if (PutForm)
+     {
+      /* Get list of degrees of the current centre */
+      Deg_GetListDegsOfCurrentCtr ();
+
+      /* Put form to select degree */
+      Frm_StartForm (ActChgCrsDegCfg);
+      HTM_SELECT_Begin (true,
+			"id=\"OthDegCod\" name=\"OthDegCod\""
+			" class=\"INPUT_SHORT_NAME\"");
+      for (NumDeg = 0;
+	   NumDeg < Gbl.Hierarchy.Ctr.Degs.Num;
+	   NumDeg++)
+	 HTM_OPTION (HTM_Type_LONG,&Gbl.Hierarchy.Ctr.Degs.Lst[NumDeg].DegCod,
+		     Gbl.Hierarchy.Ctr.Degs.Lst[NumDeg].DegCod == Gbl.Hierarchy.Deg.DegCod,false,
+		     "%s",Gbl.Hierarchy.Ctr.Degs.Lst[NumDeg].ShrtName);
+      HTM_SELECT_End ();
+      Frm_EndForm ();
+
+      /* Free list of degrees of the current centre */
+      Deg_FreeListDegs (&Gbl.Hierarchy.Ctr.Degs);
+     }
+   else	// I can not move course to another degree
+     {
+      if (!PrintView)
+	{
+         Frm_StartFormGoTo (ActSeeDegInf);
+         Deg_PutParamDegCod (Gbl.Hierarchy.Deg.DegCod);
+	 snprintf (Gbl.Title,sizeof (Gbl.Title),
+		   Txt_Go_to_X,
+		   Gbl.Hierarchy.Deg.ShrtName);
+	 HTM_BUTTON_SUBMIT_Begin (Gbl.Title,"BT_LINK LT DAT",NULL);
+	}
+      Lgo_DrawLogo (Hie_DEG,Gbl.Hierarchy.Deg.DegCod,Gbl.Hierarchy.Deg.ShrtName,
+		    20,"LM",true);
+      HTM_NBSP ();
+      HTM_Txt (Gbl.Hierarchy.Deg.FullName);
+      if (!PrintView)
+	{
+	 HTM_BUTTON_End ();
+	 Frm_EndForm ();
+	}
+     }
+   HTM_TD_End ();
+
+   HTM_TR_End ();
+  }
+
+/*****************************************************************************/
+/************** Show course full name in course configuration ****************/
+/*****************************************************************************/
+
+static void CfgCrs_FullName (bool PutForm)
+  {
+   extern const char *Txt_Course;
+
+   Hie_ConfigFullName (PutForm,Txt_Course,ActRenCrsFulCfg,
+		       Gbl.Hierarchy.Crs.FullName);
+  }
+
+/*****************************************************************************/
+/************** Show course short name in course configuration ***************/
+/*****************************************************************************/
+
+static void CfgCrs_ShrtName (bool PutForm)
+  {
+   Hie_ConfigShrtName (PutForm,ActRenCrsShoCfg,Gbl.Hierarchy.Crs.ShrtName);
+  }
+
+/*****************************************************************************/
+/***************** Show course year in course configuration ******************/
+/*****************************************************************************/
+
+static void CfgCrs_Year (bool PutForm)
+  {
+   extern const char *Txt_Year_OF_A_DEGREE;
+   extern const char *Txt_YEAR_OF_DEGREE[1 + Deg_MAX_YEARS_PER_DEGREE];
+   extern const char *Txt_Not_applicable;
+   unsigned Year;
+
+   /***** Academic year *****/
+   HTM_TR_Begin (NULL);
+
+   /* Label */
+   Frm_LabelColumn ("RT",PutForm ? "OthCrsYear" :
+	                           NULL,
+		    Txt_Year_OF_A_DEGREE);
+
+   /* Data */
+   HTM_TD_Begin ("class=\"DAT LB\"");
+   if (PutForm)
+     {
+      Frm_StartForm (ActChgCrsYeaCfg);
+      HTM_SELECT_Begin (true,
+			"id=\"OthCrsYear\" name=\"OthCrsYear\"");
+      for (Year = 0;
+	   Year <= Deg_MAX_YEARS_PER_DEGREE;
+           Year++)
+	 HTM_OPTION (HTM_Type_UNSIGNED,&Year,
+		     Year == Gbl.Hierarchy.Crs.Year,false,
+		     "%s",Txt_YEAR_OF_DEGREE[Year]);
+      HTM_SELECT_End ();
+      Frm_EndForm ();
+     }
+   else
+      HTM_Txt (Gbl.Hierarchy.Crs.Year ? Txt_YEAR_OF_DEGREE[Gbl.Hierarchy.Crs.Year] :
+	                                Txt_Not_applicable);
+   HTM_TD_End ();
+
+   HTM_TR_End ();
+  }
+
+/*****************************************************************************/
+/************* Show institutional code in course configuration ***************/
+/*****************************************************************************/
+
+static void CfgCrs_InstitutionalCode (bool PutForm)
+  {
+   extern const char *Txt_Institutional_code;
+
+   /***** Institutional course code *****/
+   HTM_TR_Begin (NULL);
+
+   /* Label */
+   Frm_LabelColumn ("RT",PutForm ? "InsCrsCod" :
+	                           NULL,
+		    Txt_Institutional_code);
+
+   /* Data */
+   HTM_TD_Begin ("class=\"DAT LB\"");
+   if (PutForm)
+     {
+      Frm_StartForm (ActChgInsCrsCodCfg);
+      HTM_INPUT_TEXT ("InsCrsCod",Crs_MAX_CHARS_INSTITUTIONAL_CRS_COD,
+		      Gbl.Hierarchy.Crs.InstitutionalCrsCod,true,
+		      "id=\"InsCrsCod\" size=\"%u\" class=\"INPUT_INS_CODE\"",
+		      Crs_MAX_CHARS_INSTITUTIONAL_CRS_COD);
+      Frm_EndForm ();
+     }
+   else
+      HTM_Txt (Gbl.Hierarchy.Crs.InstitutionalCrsCod);
+   HTM_TD_End ();
+
+   HTM_TR_End ();
+  }
+
+/*****************************************************************************/
+/**************** Show internal code in course configuration *****************/
+/*****************************************************************************/
+
+static void CfgCrs_InternalCode (void)
+  {
+   extern const char *Txt_Internal_code;
+
+   /***** Internal course code *****/
+   HTM_TR_Begin (NULL);
+
+   /* Label */
+   Frm_LabelColumn ("RT",NULL,Txt_Internal_code);
+
+   /* Data */
+   HTM_TD_Begin ("class=\"DAT LB\"");
+   HTM_Long (Gbl.Hierarchy.Crs.CrsCod);
+   HTM_TD_End ();
+
+   HTM_TR_End ();
+  }
+
+/*****************************************************************************/
+/*************** Show course shortcut in course configuration ****************/
+/*****************************************************************************/
+
+static void CfgCrs_Shortcut (bool PrintView)
+  {
+   Hie_ConfigShortcut (PrintView,"crs",Gbl.Hierarchy.Crs.CrsCod);
+  }
+
+/*****************************************************************************/
+/****************** Show course QR in course configuration *******************/
+/*****************************************************************************/
+
+static void CfgCrs_QR (void)
+  {
+   Hie_ConfigQR ("crs",Gbl.Hierarchy.Crs.CrsCod);
+  }
+
+/*****************************************************************************/
+/*********************** Number of users in this course **********************/
+/*****************************************************************************/
+
+static void CfgCrs_NumUsrsInCrs (Rol_Role_t Role)
+  {
+   extern const char *Txt_ROLES_PLURAL_Abc[Rol_NUM_ROLES][Usr_NUM_SEXS];
+
+   /***** Number of users in course *****/
+   HTM_TR_Begin (NULL);
+
+   /* Label */
+   Frm_LabelColumn ("RT",NULL,Txt_ROLES_PLURAL_Abc[Role][Usr_SEX_UNKNOWN]);
+
+   /* Data */
+   HTM_TD_Begin ("class=\"DAT LB\"");
+   HTM_Unsigned (Gbl.Hierarchy.Crs.NumUsrs[Role]);
+   HTM_TD_End ();
+
+   HTM_TR_End ();
+  }
+
+/*****************************************************************************/
+/****************** Show indicators in course configuration ******************/
+/*****************************************************************************/
+
+static void CfgCrs_Indicators (void)
+  {
+   extern const char *Txt_Indicators;
+   extern const char *Txt_of_PART_OF_A_TOTAL;
+   struct Ind_IndicatorsCrs Indicators;
+   int NumIndicatorsFromDB = Ind_GetNumIndicatorsCrsFromDB (Gbl.Hierarchy.Crs.CrsCod);
+
+   /***** Compute indicators ******/
+   Ind_ComputeAndStoreIndicatorsCrs (Gbl.Hierarchy.Crs.CrsCod,
+				     NumIndicatorsFromDB,&Indicators);
+
+   /***** Number of indicators *****/
+   HTM_TR_Begin (NULL);
+
+   /* Label */
+   Frm_LabelColumn ("RT",NULL,Txt_Indicators);
+
+   /* Data */
+   HTM_TD_Begin ("class=\"LB\"");
+   Frm_StartForm (ActReqStaCrs);
+   snprintf (Gbl.Title,sizeof (Gbl.Title),
+	     "%u %s %u",
+	     Indicators.NumIndicators,
+	     Txt_of_PART_OF_A_TOTAL,Ind_NUM_INDICATORS);
+   HTM_BUTTON_SUBMIT_Begin (Gbl.Title,"BT_LINK DAT",NULL);
+   HTM_TxtF ("%s&nbsp;",Gbl.Title);
+   Ico_PutIcon ((Indicators.NumIndicators == Ind_NUM_INDICATORS) ? "check-circle.svg" :
+								   "exclamation-triangle.svg",
+		Gbl.Title,"ICO16x16");
+   HTM_BUTTON_End ();
+   Frm_EndForm ();
+   HTM_TD_End ();
+
+   HTM_TR_End ();
+  }
diff --git a/swad_config_course.h b/swad_config_course.h
new file mode 100644
index 00000000..3324c6e2
--- /dev/null
+++ b/swad_config_course.h
@@ -0,0 +1,48 @@
+// swad_config_course.h: configuration of current course
+
+#ifndef _SWAD_CFGCRS
+#define _SWAD_CFGCRS
+/*
+    SWAD (Shared Workspace At a Distance in Spanish),
+    is a web platform developed at the University of Granada (Spain),
+    and used to support university teaching.
+
+    This file is part of SWAD core.
+    Copyright (C) 1999-2019 Antonio Cañas Vargas
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/*****************************************************************************/
+/********************************* Headers ***********************************/
+/*****************************************************************************/
+
+#include <stdbool.h>		// For boolean type
+
+/*****************************************************************************/
+/***************************** Public constants ******************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/******************************* Public types ********************************/
+/*****************************************************************************/
+
+/*****************************************************************************/
+/***************************** Public prototypes *****************************/
+/*****************************************************************************/
+
+void CfgCrs_Configuration (bool PrintView);
+void CfgCrs_PrintConfiguration (void);
+void CfgCrs_ContEditAfterChgCrsInConfig (void);
+
+#endif
diff --git a/swad_connected.c b/swad_connected.c
index 6c6bdb08..3f56a5c6 100644
--- a/swad_connected.c
+++ b/swad_connected.c
@@ -27,7 +27,7 @@
 
 #include <limits.h>		// For maximum values
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For fprintf
 #include <string.h>		// For string functions
 
diff --git a/swad_country.c b/swad_country.c
index 179f93cf..6a76537c 100644
--- a/swad_country.c
+++ b/swad_country.c
@@ -26,8 +26,8 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
 #include <math.h>		// For log10, ceil, pow...
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_course.c b/swad_course.c
index ee76c83f..0affb813 100644
--- a/swad_course.c
+++ b/swad_course.c
@@ -26,33 +26,19 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
-#include <limits.h>		// For maximum values
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
-#include <stdlib.h>		// For getenv, etc.
 #include <string.h>		// For string functions
 
-#include "swad_box.h"
+#include "swad_config_course.h"
 #include "swad_course.h"
-#include "swad_constant.h"
 #include "swad_database.h"
-#include "swad_degree.h"
-#include "swad_enrolment.h"
-#include "swad_exam.h"
 #include "swad_form.h"
 #include "swad_global.h"
 #include "swad_help.h"
-#include "swad_hierarchy.h"
 #include "swad_HTML.h"
-#include "swad_indicator.h"
+#include "swad_info.h"
 #include "swad_logo.h"
-#include "swad_notification.h"
-#include "swad_parameter.h"
-#include "swad_role.h"
-#include "swad_RSS.h"
-#include "swad_tab.h"
-#include "swad_theme.h"
 
 /*****************************************************************************/
 /************** External global variables from others modules ****************/
@@ -78,20 +64,6 @@ static struct Course *Crs_EditingCrs = NULL;	// Static variable to keep the cour
 /**************************** Private prototypes *****************************/
 /*****************************************************************************/
 
-static void Crs_Configuration (bool PrintView);
-static void Crs_PutIconToPrint (void);
-static void Crs_ConfigTitle (bool PutLink);
-static void Crs_ConfigDegree (bool PrintView,bool PutForm);
-static void Crs_ConfigFullName (bool PutForm);
-static void Crs_ConfigShrtName (bool PutForm);
-static void Crs_ConfigYear (bool PutForm);
-static void Crs_ConfigInstitutionalCode (bool PutForm);
-static void Crs_ConfigInternalCode (void);
-static void Crs_ConfigShortcut (bool PrintView);
-static void Crs_ConfigQR (void);
-static void Crs_ShowNumUsrsInCrs (Rol_Role_t Role);
-static void Crs_ConfigIndicators (void);
-
 static void Crs_WriteListMyCoursesToSelectOne (void);
 
 static void Crs_GetListCoursesInCurrentDegree (Crs_WhatCourses_t WhatCourses);
@@ -155,7 +127,7 @@ void Crs_ShowIntroduction (void)
   {
    /***** Course configuration *****/
    HTM_DIV_Begin ("class=\"CM\"");
-   Crs_Configuration (false);
+   CfgCrs_Configuration (false);
    HTM_DIV_End ();
 
    /***** Course introduction *****/
@@ -165,404 +137,6 @@ void Crs_ShowIntroduction (void)
    Hlp_ShowHelpWhatWouldYouLikeToDo ();
   }
 
-/*****************************************************************************/
-/***************** Print configuration of the current course *****************/
-/*****************************************************************************/
-
-void Crs_PrintConfiguration (void)
-  {
-   Crs_Configuration (true);
-  }
-
-/*****************************************************************************/
-/***************** Configuration of the current course ***********************/
-/*****************************************************************************/
-
-static void Crs_Configuration (bool PrintView)
-  {
-   extern const char *Hlp_COURSE_Information;
-   bool PutLink;
-   bool PutFormDeg;
-   bool PutFormName;
-   bool PutFormYear;
-   bool PutFormInsCod;
-
-   /***** Trivial check *****/
-   if (Gbl.Hierarchy.Crs.CrsCod <= 0)	// No course selected
-      return;
-
-   /***** Initializations *****/
-   PutLink       = !PrintView && Gbl.Hierarchy.Deg.WWW[0];
-   PutFormDeg    = !PrintView && Gbl.Usrs.Me.Role.Logged >= Rol_CTR_ADM;
-   PutFormName   = !PrintView && Gbl.Usrs.Me.Role.Logged >= Rol_DEG_ADM;
-   PutFormYear   =
-   PutFormInsCod = !PrintView && Gbl.Usrs.Me.Role.Logged >= Rol_TCH;
-
-   /***** Contextual menu *****/
-   if (!PrintView)
-      if (Gbl.Usrs.Me.Role.Logged == Rol_GST ||
-	  Gbl.Usrs.Me.Role.Logged == Rol_USR)
-	{
-         Mnu_ContextMenuBegin ();
-         Enr_PutLinkToRequestSignUp ();	// Request enrolment in the current course
-         Mnu_ContextMenuEnd ();
-	}
-
-   /***** Begin box *****/
-   if (PrintView)
-      Box_BoxBegin (NULL,NULL,NULL,
-		    NULL,Box_NOT_CLOSABLE);
-   else
-      Box_BoxBegin (NULL,NULL,Crs_PutIconToPrint,
-		    Hlp_COURSE_Information,Box_NOT_CLOSABLE);
-
-   /***** Title *****/
-   Crs_ConfigTitle (PutLink);
-
-   /**************************** Left part ***********************************/
-   HTM_DIV_Begin ("class=\"HIE_CFG_LEFT\"");
-
-   /***** Begin table *****/
-   HTM_TABLE_BeginWidePadding (2);
-
-   /***** Degree *****/
-   Crs_ConfigDegree (PrintView,PutFormDeg);
-
-   /***** Course name *****/
-   Crs_ConfigFullName (PutFormName);
-   Crs_ConfigShrtName (PutFormName);
-
-   /***** Course year *****/
-   Crs_ConfigYear (PutFormYear);
-
-   if (!PrintView)
-     {
-      /***** Institutional code of the course *****/
-      Crs_ConfigInstitutionalCode (PutFormInsCod);
-
-      /***** Internal code of the course *****/
-      Crs_ConfigInternalCode ();
-     }
-
-   /***** Shortcut to the couse *****/
-   Crs_ConfigShortcut (PrintView);
-
-   if (PrintView)
-      /***** QR code with link to the course *****/
-      Crs_ConfigQR ();
-   else
-     {
-      /***** Number of users *****/
-      Crs_ShowNumUsrsInCrs (Rol_TCH);
-      Crs_ShowNumUsrsInCrs (Rol_NET);
-      Crs_ShowNumUsrsInCrs (Rol_STD);
-
-      /***** Indicators *****/
-      Crs_ConfigIndicators ();
-     }
-
-   /***** End table *****/
-   HTM_TABLE_End ();
-
-   /***** End of left part *****/
-   HTM_DIV_End ();
-
-   /***** End box *****/
-   Box_BoxEnd ();
-  }
-
-/*****************************************************************************/
-/************* Put icon to print the configuration of a course ***************/
-/*****************************************************************************/
-
-static void Crs_PutIconToPrint (void)
-  {
-   Ico_PutContextualIconToPrint (ActPrnCrsInf,NULL);
-  }
-
-/*****************************************************************************/
-/******************** Show title in course configuration *********************/
-/*****************************************************************************/
-
-static void Crs_ConfigTitle (bool PutLink)
-  {
-   Hie_ConfigTitle (PutLink,
-		    Hie_DEG,				// Logo scope
-		    Gbl.Hierarchy.Deg.DegCod,		// Logo code
-                    Gbl.Hierarchy.Deg.ShrtName,		// Logo short name
-		    Gbl.Hierarchy.Deg.FullName,		// Logo full name
-		    Gbl.Hierarchy.Deg.WWW,		// Logo www
-		    Gbl.Hierarchy.Crs.FullName);	// Text full name
-  }
-
-/*****************************************************************************/
-/******************** Show degree in course configuration ********************/
-/*****************************************************************************/
-
-static void Crs_ConfigDegree (bool PrintView,bool PutForm)
-  {
-   extern const char *Txt_Degree;
-   extern const char *Txt_Go_to_X;
-   unsigned NumDeg;
-
-   /***** Degree *****/
-   HTM_TR_Begin (NULL);
-
-   /* Label */
-   Frm_LabelColumn ("RT",PutForm ? "OthDegCod" :
-	                           NULL,
-		    Txt_Degree);
-
-   /* Data */
-   HTM_TD_Begin ("class=\"DAT LB\"");
-   if (PutForm)
-     {
-      /* Get list of degrees of the current centre */
-      Deg_GetListDegsOfCurrentCtr ();
-
-      /* Put form to select degree */
-      Frm_StartForm (ActChgCrsDegCfg);
-      HTM_SELECT_Begin (true,
-			"id=\"OthDegCod\" name=\"OthDegCod\""
-			" class=\"INPUT_SHORT_NAME\"");
-      for (NumDeg = 0;
-	   NumDeg < Gbl.Hierarchy.Ctr.Degs.Num;
-	   NumDeg++)
-	 HTM_OPTION (HTM_Type_LONG,&Gbl.Hierarchy.Ctr.Degs.Lst[NumDeg].DegCod,
-		     Gbl.Hierarchy.Ctr.Degs.Lst[NumDeg].DegCod == Gbl.Hierarchy.Deg.DegCod,false,
-		     "%s",Gbl.Hierarchy.Ctr.Degs.Lst[NumDeg].ShrtName);
-      HTM_SELECT_End ();
-      Frm_EndForm ();
-
-      /* Free list of degrees of the current centre */
-      Deg_FreeListDegs (&Gbl.Hierarchy.Ctr.Degs);
-     }
-   else	// I can not move course to another degree
-     {
-      if (!PrintView)
-	{
-         Frm_StartFormGoTo (ActSeeDegInf);
-         Deg_PutParamDegCod (Gbl.Hierarchy.Deg.DegCod);
-	 snprintf (Gbl.Title,sizeof (Gbl.Title),
-		   Txt_Go_to_X,
-		   Gbl.Hierarchy.Deg.ShrtName);
-	 HTM_BUTTON_SUBMIT_Begin (Gbl.Title,"BT_LINK LT DAT",NULL);
-	}
-      Lgo_DrawLogo (Hie_DEG,Gbl.Hierarchy.Deg.DegCod,Gbl.Hierarchy.Deg.ShrtName,
-		    20,"LM",true);
-      HTM_NBSP ();
-      HTM_Txt (Gbl.Hierarchy.Deg.FullName);
-      if (!PrintView)
-	{
-	 HTM_BUTTON_End ();
-	 Frm_EndForm ();
-	}
-     }
-   HTM_TD_End ();
-
-   HTM_TR_End ();
-  }
-
-/*****************************************************************************/
-/************** Show course full name in course configuration ****************/
-/*****************************************************************************/
-
-static void Crs_ConfigFullName (bool PutForm)
-  {
-   extern const char *Txt_Course;
-
-   Hie_ConfigFullName (PutForm,Txt_Course,ActRenCrsFulCfg,
-		       Gbl.Hierarchy.Crs.FullName);
-  }
-
-/*****************************************************************************/
-/************** Show course short name in course configuration ***************/
-/*****************************************************************************/
-
-static void Crs_ConfigShrtName (bool PutForm)
-  {
-   Hie_ConfigShrtName (PutForm,ActRenCrsShoCfg,Gbl.Hierarchy.Crs.ShrtName);
-  }
-
-/*****************************************************************************/
-/***************** Show course year in course configuration ******************/
-/*****************************************************************************/
-
-static void Crs_ConfigYear (bool PutForm)
-  {
-   extern const char *Txt_Year_OF_A_DEGREE;
-   extern const char *Txt_YEAR_OF_DEGREE[1 + Deg_MAX_YEARS_PER_DEGREE];
-   extern const char *Txt_Not_applicable;
-   unsigned Year;
-
-   /***** Academic year *****/
-   HTM_TR_Begin (NULL);
-
-   /* Label */
-   Frm_LabelColumn ("RT",PutForm ? "OthCrsYear" :
-	                           NULL,
-		    Txt_Year_OF_A_DEGREE);
-
-   /* Data */
-   HTM_TD_Begin ("class=\"DAT LB\"");
-   if (PutForm)
-     {
-      Frm_StartForm (ActChgCrsYeaCfg);
-      HTM_SELECT_Begin (true,
-			"id=\"OthCrsYear\" name=\"OthCrsYear\"");
-      for (Year = 0;
-	   Year <= Deg_MAX_YEARS_PER_DEGREE;
-           Year++)
-	 HTM_OPTION (HTM_Type_UNSIGNED,&Year,
-		     Year == Gbl.Hierarchy.Crs.Year,false,
-		     "%s",Txt_YEAR_OF_DEGREE[Year]);
-      HTM_SELECT_End ();
-      Frm_EndForm ();
-     }
-   else
-      HTM_Txt (Gbl.Hierarchy.Crs.Year ? Txt_YEAR_OF_DEGREE[Gbl.Hierarchy.Crs.Year] :
-	                                Txt_Not_applicable);
-   HTM_TD_End ();
-
-   HTM_TR_End ();
-  }
-
-/*****************************************************************************/
-/************* Show institutional code in course configuration ***************/
-/*****************************************************************************/
-
-static void Crs_ConfigInstitutionalCode (bool PutForm)
-  {
-   extern const char *Txt_Institutional_code;
-
-   /***** Institutional course code *****/
-   HTM_TR_Begin (NULL);
-
-   /* Label */
-   Frm_LabelColumn ("RT",PutForm ? "InsCrsCod" :
-	                           NULL,
-		    Txt_Institutional_code);
-
-   /* Data */
-   HTM_TD_Begin ("class=\"DAT LB\"");
-   if (PutForm)
-     {
-      Frm_StartForm (ActChgInsCrsCodCfg);
-      HTM_INPUT_TEXT ("InsCrsCod",Crs_MAX_CHARS_INSTITUTIONAL_CRS_COD,
-		      Gbl.Hierarchy.Crs.InstitutionalCrsCod,true,
-		      "id=\"InsCrsCod\" size=\"%u\" class=\"INPUT_INS_CODE\"",
-		      Crs_MAX_CHARS_INSTITUTIONAL_CRS_COD);
-      Frm_EndForm ();
-     }
-   else
-      HTM_Txt (Gbl.Hierarchy.Crs.InstitutionalCrsCod);
-   HTM_TD_End ();
-
-   HTM_TR_End ();
-  }
-
-/*****************************************************************************/
-/**************** Show internal code in course configuration *****************/
-/*****************************************************************************/
-
-static void Crs_ConfigInternalCode (void)
-  {
-   extern const char *Txt_Internal_code;
-
-   /***** Internal course code *****/
-   HTM_TR_Begin (NULL);
-
-   /* Label */
-   Frm_LabelColumn ("RT",NULL,Txt_Internal_code);
-
-   /* Data */
-   HTM_TD_Begin ("class=\"DAT LB\"");
-   HTM_Long (Gbl.Hierarchy.Crs.CrsCod);
-   HTM_TD_End ();
-
-   HTM_TR_End ();
-  }
-
-/*****************************************************************************/
-/*************** Show course shortcut in course configuration ****************/
-/*****************************************************************************/
-
-static void Crs_ConfigShortcut (bool PrintView)
-  {
-   Hie_ConfigShortcut (PrintView,"crs",Gbl.Hierarchy.Crs.CrsCod);
-  }
-
-/*****************************************************************************/
-/****************** Show course QR in course configuration *******************/
-/*****************************************************************************/
-
-static void Crs_ConfigQR (void)
-  {
-   Hie_ConfigQR ("crs",Gbl.Hierarchy.Crs.CrsCod);
-  }
-
-/*****************************************************************************/
-/*********************** Number of users in this course **********************/
-/*****************************************************************************/
-
-static void Crs_ShowNumUsrsInCrs (Rol_Role_t Role)
-  {
-   extern const char *Txt_ROLES_PLURAL_Abc[Rol_NUM_ROLES][Usr_NUM_SEXS];
-
-   /***** Number of users in course *****/
-   HTM_TR_Begin (NULL);
-
-   /* Label */
-   Frm_LabelColumn ("RT",NULL,Txt_ROLES_PLURAL_Abc[Role][Usr_SEX_UNKNOWN]);
-
-   /* Data */
-   HTM_TD_Begin ("class=\"DAT LB\"");
-   HTM_Unsigned (Gbl.Hierarchy.Crs.NumUsrs[Role]);
-   HTM_TD_End ();
-
-   HTM_TR_End ();
-  }
-
-/*****************************************************************************/
-/****************** Show indicators in course configuration ******************/
-/*****************************************************************************/
-
-static void Crs_ConfigIndicators (void)
-  {
-   extern const char *Txt_Indicators;
-   extern const char *Txt_of_PART_OF_A_TOTAL;
-   struct Ind_IndicatorsCrs Indicators;
-   int NumIndicatorsFromDB = Ind_GetNumIndicatorsCrsFromDB (Gbl.Hierarchy.Crs.CrsCod);
-
-   /***** Compute indicators ******/
-   Ind_ComputeAndStoreIndicatorsCrs (Gbl.Hierarchy.Crs.CrsCod,
-				     NumIndicatorsFromDB,&Indicators);
-
-   /***** Number of indicators *****/
-   HTM_TR_Begin (NULL);
-
-   /* Label */
-   Frm_LabelColumn ("RT",NULL,Txt_Indicators);
-
-   /* Data */
-   HTM_TD_Begin ("class=\"LB\"");
-   Frm_StartForm (ActReqStaCrs);
-   snprintf (Gbl.Title,sizeof (Gbl.Title),
-	     "%u %s %u",
-	     Indicators.NumIndicators,
-	     Txt_of_PART_OF_A_TOTAL,Ind_NUM_INDICATORS);
-   HTM_BUTTON_SUBMIT_Begin (Gbl.Title,"BT_LINK DAT",NULL);
-   HTM_TxtF ("%s&nbsp;",Gbl.Title);
-   Ico_PutIcon ((Indicators.NumIndicators == Ind_NUM_INDICATORS) ? "check-circle.svg" :
-								   "exclamation-triangle.svg",
-		Gbl.Title,"ICO16x16");
-   HTM_BUTTON_End ();
-   Frm_EndForm ();
-   HTM_TD_End ();
-
-   HTM_TR_End ();
-  }
-
 /*****************************************************************************/
 /************************ Write menu with my courses *************************/
 /*****************************************************************************/
@@ -2438,7 +2012,7 @@ void Crs_ChangeCrsDegInConfig (void)
 /** Show message of success after changing a course in course configuration **/
 /*****************************************************************************/
 
-void Crs_ContEditAfterChgCrsInConfig (void)
+void CfgCrs_ContEditAfterChgCrsInConfig (void)
   {
    /***** Write error/success message *****/
    Ale_ShowAlerts (NULL);
diff --git a/swad_course.h b/swad_course.h
index 57080d0f..fdd32529 100644
--- a/swad_course.h
+++ b/swad_course.h
@@ -1,4 +1,4 @@
-// swad_course.c: edition of courses
+// swad_course.h: edition of courses
 
 #ifndef _SWAD_CRS
 #define _SWAD_CRS
@@ -99,8 +99,8 @@ typedef enum
 /*****************************************************************************/
 
 void Crs_ShowIntroduction (void);
-void Crs_PrintConfiguration (void);
-void Crs_ContEditAfterChgCrsInConfig (void);
+void CfgCrs_PrintConfiguration (void);
+void CfgCrs_ContEditAfterChgCrsInConfig (void);
 
 unsigned Crs_GetNumCrssTotal (void);
 unsigned Crs_GetNumCrssInCty (long CtyCod);
diff --git a/swad_database.c b/swad_database.c
index 216268b7..937de420 100644
--- a/swad_database.c
+++ b/swad_database.c
@@ -27,9 +27,9 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For vasprintf
-#include <linux/stddef.h>	// For NULL
 #include <mysql/mysql.h>	// To access MySQL databases
 #include <stdarg.h>		// For va_start, va_end
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For FILE, fprintf, vasprintf
 #include <stdlib.h>		// For free
 
diff --git a/swad_degree.c b/swad_degree.c
index 415baea0..c32dfec1 100644
--- a/swad_degree.c
+++ b/swad_degree.c
@@ -26,8 +26,8 @@
 /*****************************************************************************/
 
 #include <ctype.h>		// For isprint, isspace, etc.
-#include <linux/stddef.h>	// For NULL
 #include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For fprintf, etc.
 #include <stdlib.h>		// For exit, system, calloc, free, etc.
 #include <string.h>		// For string functions
diff --git a/swad_degree_type.c b/swad_degree_type.c
index 62168d27..91ce6202 100644
--- a/swad_degree_type.c
+++ b/swad_degree_type.c
@@ -26,8 +26,8 @@
 /*****************************************************************************/
 
 #include <ctype.h>		// For isprint, isspace, etc.
-#include <linux/stddef.h>	// For NULL
 #include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For fprintf, etc.
 #include <stdlib.h>		// For exit, system, calloc, free, etc.
 #include <string.h>		// For string functions
diff --git a/swad_department.c b/swad_department.c
index d9c2caf9..63faf27a 100644
--- a/swad_department.c
+++ b/swad_department.c
@@ -25,8 +25,8 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
 #include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
diff --git a/swad_exam.c b/swad_exam.c
index b200449d..bd33ab67 100644
--- a/swad_exam.c
+++ b/swad_exam.c
@@ -31,7 +31,7 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For sscanf, asprintf, etc.
 #include <stdlib.h>		// For exit, system, malloc, calloc, free, etc.
 #include <string.h>		// For string functions
diff --git a/swad_file.c b/swad_file.c
index 1a3d919a..0e3babe0 100644
--- a/swad_file.c
+++ b/swad_file.c
@@ -29,7 +29,7 @@
 #include <dirent.h>		// For scandir, etc.
 #include <errno.h>		// For errno
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For FILE,fprintf
 #include <stdlib.h>		// For exit, system, free, etc.
 #include <string.h>		// For string functions
diff --git a/swad_file_browser.c b/swad_file_browser.c
index 3a40ad4c..9d66642f 100644
--- a/swad_file_browser.c
+++ b/swad_file_browser.c
@@ -29,13 +29,13 @@
 #include <dirent.h>		// For scandir, etc.
 #include <errno.h>		// For errno
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For exit, system, free, etc
 #include <string.h>		// For string functions
-#include <time.h>		// For time
 #include <sys/types.h>		// For lstat, time_t
 #include <sys/stat.h>		// For lstat
+#include <time.h>		// For time
 #include <unistd.h>		// For access, lstat, getpid, chdir, symlink
 
 #include "swad_box.h"
diff --git a/swad_forum.c b/swad_forum.c
index 5fbd5dd8..0315f7c6 100644
--- a/swad_forum.c
+++ b/swad_forum.c
@@ -26,9 +26,9 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
 #include <malloc.h>		// For malloc
 #include <mysql/mysql.h>	// To access MySQL databases
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <string.h>
 #include <time.h>		// For time_t
diff --git a/swad_game.c b/swad_game.c
index b384a663..d3de982c 100644
--- a/swad_game.c
+++ b/swad_game.c
@@ -28,7 +28,7 @@
 #define _GNU_SOURCE 		// For asprintf
 #include <float.h>		// For DBL_MAX
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_global.c b/swad_global.c
index 108705f5..aaabac95 100644
--- a/swad_global.c
+++ b/swad_global.c
@@ -25,8 +25,8 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
 #include <locale.h>		// For setlocale
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For exit
 #include <string.h>		// For string functions
 #include <sys/time.h>		// For gettimeofday
diff --git a/swad_group.c b/swad_group.c
index 43d4971e..ec0da9f6 100644
--- a/swad_group.c
+++ b/swad_group.c
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For exit, system, malloc, free, rand, etc.
 #include <string.h>		// For string functions
diff --git a/swad_holiday.c b/swad_holiday.c
index 102b227f..5c984e21 100644
--- a/swad_holiday.c
+++ b/swad_holiday.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
diff --git a/swad_indicator.c b/swad_indicator.c
index 4c4d3354..23cbf1c6 100644
--- a/swad_indicator.c
+++ b/swad_indicator.c
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For aprintf
 #include <mysql/mysql.h>	// To access MySQL databases
 
diff --git a/swad_info.c b/swad_info.c
index 1fe77e3e..238fd58e 100644
--- a/swad_info.c
+++ b/swad_info.c
@@ -27,7 +27,7 @@
 
 #include <limits.h>		// For maximum values
 #include <linux/limits.h>	// For PATH_MAX, NAME_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For getenv, etc
 #include <stdsoap2.h>		// For SOAP_OK and soap functions
 #include <string.h>		// For string functions
diff --git a/swad_institution.c b/swad_institution.c
index b31a9129..ec37d185 100644
--- a/swad_institution.c
+++ b/swad_institution.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
diff --git a/swad_layout.c b/swad_layout.c
index b1f51efe..22e31c69 100644
--- a/swad_layout.c
+++ b/swad_layout.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For exit
 #include <string.h>		// For string functions
 
diff --git a/swad_link.c b/swad_link.c
index 940af738..1f91822a 100644
--- a/swad_link.c
+++ b/swad_link.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
diff --git a/swad_mail.c b/swad_mail.c
index 6b57a93a..47e557c0 100644
--- a/swad_mail.c
+++ b/swad_mail.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 #include <sys/wait.h>		// For the macro WEXITSTATUS
diff --git a/swad_main.c b/swad_main.c
index 60cdebba..241dd381 100644
--- a/swad_main.c
+++ b/swad_main.c
@@ -25,7 +25,7 @@
 /*********************************** Headers *********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For exit
 #include <string.h>
 #include <unistd.h>		// For sleep
diff --git a/swad_mark.c b/swad_mark.c
index 196ffb7c..52bfe0c5 100644
--- a/swad_mark.c
+++ b/swad_mark.c
@@ -27,8 +27,8 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
 #include <malloc.h>		// For malloc
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <string.h>		// For string functions
 #include <unistd.h>		// For unlink
diff --git a/swad_match.c b/swad_match.c
index 65d68a58..6d05ffbe 100644
--- a/swad_match.c
+++ b/swad_match.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_match_result.c b/swad_match_result.c
index d546c247..c80c1e90 100644
--- a/swad_match_result.c
+++ b/swad_match_result.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_message.c b/swad_message.c
index 5c015ff8..741dc84f 100644
--- a/swad_message.c
+++ b/swad_message.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 #include <string.h>		// For string functions
diff --git a/swad_notice.c b/swad_notice.c
index abf2dd4a..f00fb328 100644
--- a/swad_notice.c
+++ b/swad_notice.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For sscanf, asprintf, etc.
 #include <stdlib.h>		// For exit, system, malloc, calloc, free, etc.
 #include <string.h>
diff --git a/swad_notification.c b/swad_notification.c
index ce2ea50e..6992d89c 100644
--- a/swad_notification.c
+++ b/swad_notification.c
@@ -25,7 +25,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For system
 #include <string.h>
 #include <sys/wait.h>		// For the macro WEXITSTATUS
diff --git a/swad_pagination.c b/swad_pagination.c
index 477386ca..9af2dcf8 100644
--- a/swad_pagination.c
+++ b/swad_pagination.c
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For free
 
diff --git a/swad_parameter.c b/swad_parameter.c
index 2531cabe..c3e8a6a4 100644
--- a/swad_parameter.c
+++ b/swad_parameter.c
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 #include <ctype.h>		// For isprint, isspace, etc.
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
diff --git a/swad_photo.c b/swad_photo.c
index 185b172b..7e60d40b 100644
--- a/swad_photo.c
+++ b/swad_photo.c
@@ -27,8 +27,8 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
 #include <math.h>		// For log10, floor, ceil, modf, sqrt...
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For system, getenv, etc.
 #include <string.h>		// For string functions
diff --git a/swad_place.c b/swad_place.c
index 387bfd53..cf351246 100644
--- a/swad_place.c
+++ b/swad_place.c
@@ -25,7 +25,7 @@
 /********************************** Headers **********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
 
diff --git a/swad_plugin.c b/swad_plugin.c
index bb1cf61e..ffdbb636 100644
--- a/swad_plugin.c
+++ b/swad_plugin.c
@@ -29,8 +29,8 @@ TODO: Check if web service is called from an authorized IP.
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
 #include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For fprintf, asprintf
 #include <stdlib.h>		// For calloc, free
 #include <string.h>
diff --git a/swad_profile.c b/swad_profile.c
index 3dc1e3af..ce6f4fd7 100644
--- a/swad_profile.c
+++ b/swad_profile.c
@@ -25,7 +25,7 @@
 /*********************************** Headers *********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <string.h>		// For string functions
 
 #include "swad_box.h"
diff --git a/swad_project.c b/swad_project.c
index 6668e500..38dd7bca 100644
--- a/swad_project.c
+++ b/swad_project.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_record.c b/swad_record.c
index 97559f23..3dfbd5b3 100644
--- a/swad_record.c
+++ b/swad_record.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>
diff --git a/swad_session.c b/swad_session.c
index 0e1aaa65..dbcc5d91 100644
--- a/swad_session.c
+++ b/swad_session.c
@@ -25,8 +25,8 @@
 /************************************ Headers ********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
 #include <mysql/mysql.h>	// To access MySQL databases
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For sprintf
 #include <stdlib.h>		// For malloc and free
 #include <string.h>		// For string functions
diff --git a/swad_setting.c b/swad_setting.c
index 2890adcf..37690868 100644
--- a/swad_setting.c
+++ b/swad_setting.c
@@ -25,8 +25,8 @@
 /********************************** Headers **********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
 #include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For fprintf, etc.
 #include <string.h>
 
diff --git a/swad_string.c b/swad_string.c
index 78fb9373..51366632 100644
--- a/swad_string.c
+++ b/swad_string.c
@@ -26,10 +26,10 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
 #include <ctype.h>		// For isprint, isspace, etc.
 #include <locale.h>		// For setlocale
 #include <math.h>		// For log10, floor, ceil, modf, sqrt...
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For malloc and free
 #include <string.h>		// For string functions
diff --git a/swad_survey.c b/swad_survey.c
index 36b4830c..fefab82f 100644
--- a/swad_survey.c
+++ b/swad_survey.c
@@ -27,7 +27,7 @@
 
 #define _GNU_SOURCE 		// For asprintf
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For calloc
 #include <string.h>		// For string functions
diff --git a/swad_syllabus.c b/swad_syllabus.c
index 7e8828c2..88999d70 100644
--- a/swad_syllabus.c
+++ b/swad_syllabus.c
@@ -27,9 +27,9 @@
 
 #include <unistd.h>		// For SEEK_SET
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
-#include <stdsoap2.h>		// For SOAP_OK and soap functions
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For free ()
+#include <stdsoap2.h>		// For SOAP_OK and soap functions
 #include <string.h>		// For string functions
 #include <time.h>		// For time ()
 
diff --git a/swad_test.c b/swad_test.c
index df3edce5..6c58358a 100644
--- a/swad_test.c
+++ b/swad_test.c
@@ -28,9 +28,9 @@
 #define _GNU_SOURCE 		// For asprintf
 #include <limits.h>		// For UINT_MAX
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
 #include <mysql/mysql.h>	// To access MySQL databases
 #include <stdbool.h>		// For boolean type
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For fprintf, asprintf, etc.
 #include <stdlib.h>		// For exit, system, malloc, free, etc
 #include <string.h>		// For string functions
diff --git a/swad_text.c b/swad_text.c
index ef960d41..c360ea0d 100644
--- a/swad_text.c
+++ b/swad_text.c
@@ -54,7 +54,7 @@
 /********************************* Headers ***********************************/
 /*****************************************************************************/
 
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 
 #include "swad_action.h"
 #include "swad_assignment.h"
diff --git a/swad_timetable.c b/swad_timetable.c
index 1facc709..419091e6 100644
--- a/swad_timetable.c
+++ b/swad_timetable.c
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 #define _GNU_SOURCE 		// For asprintf
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For malloc, calloc, free
 #include <string.h>		// For string functions
diff --git a/swad_user.c b/swad_user.c
index 1950f753..df47f38f 100644
--- a/swad_user.c
+++ b/swad_user.c
@@ -29,7 +29,7 @@
 #include <ctype.h>		// For isalnum, isdigit, etc.
 #include <limits.h>		// For maximum values
 #include <linux/limits.h>	// For PATH_MAX
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdio.h>		// For asprintf
 #include <stdlib.h>		// For exit, system, malloc, free, rand, etc.
 #include <string.h>		// For string functions
diff --git a/swad_xml.c b/swad_xml.c
index a61fc202..16f616a2 100644
--- a/swad_xml.c
+++ b/swad_xml.c
@@ -26,7 +26,7 @@
 /*****************************************************************************/
 
 #include <ctype.h>		// For isspace()
-#include <linux/stddef.h>	// For NULL
+#include <stddef.h>		// For NULL
 #include <stdlib.h>		// For free ()
 #include <string.h>		// For strlen (), etc.