diff --git a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_core.C b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_core.C
index c203f2b0c19..a28e492f03d 100644
--- a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_core.C
+++ b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_core.C
@@ -18,6 +18,7 @@
 //
 // Author(s)     : Daniel Russel <drussel@alumni.princeton.edu>
 
+#include <CGAL/basic.h>
 
 #include <CGAL/Kinetic/IO/internal/Qt_core.h>
 
diff --git a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_timer.C b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_timer.C
index 51d6de0c7d9..47d28d34831 100644
--- a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_timer.C
+++ b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_timer.C
@@ -18,6 +18,8 @@
 //
 // Author(s)     : Daniel Russel <drussel@alumni.princeton.edu>
 
+#include <CGAL/basic.h>
+
 #include <CGAL/Kinetic/basic.h>
 #include <CGAL/Kinetic/IO/internal/Qt_timer.h>
 
diff --git a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_widget_2_core.C b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_widget_2_core.C
index 7b078e9e91e..a933545a2c6 100644
--- a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_widget_2_core.C
+++ b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_widget_2_core.C
@@ -18,7 +18,7 @@
 //
 // Author(s)     : Daniel Russel <drussel@alumni.princeton.edu>
 
-
+#include <CGAL/basic.h>
 #include <CGAL/Kinetic/IO/internal/Qt_widget_2_core.h>
 
 #include "Kinetic_Qt_widget_2_core.moc"
diff --git a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_window_2.C b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_window_2.C
index e8ffaea14c0..48564f9abfe 100644
--- a/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_window_2.C
+++ b/Kinetic_data_structures/src/CGALQt/Kinetic_Qt_window_2.C
@@ -18,6 +18,8 @@
 //
 // Author(s)     : Daniel Russel <drussel@alumni.princeton.edu>
 
+#include <CGAL/basic.h>
+
 #include <CGAL/Kinetic/IO/internal/Qt_window_2.h>
 #include <CGAL/Kinetic/IO/internal/pixmaps.h>
 #include "Kinetic_Qt_window_2.moc"
diff --git a/Kinetic_data_structures/src/CGALQt/Kinetic_pixmaps.C b/Kinetic_data_structures/src/CGALQt/Kinetic_pixmaps.C
index 5d939362e99..30b92f34b2e 100644
--- a/Kinetic_data_structures/src/CGALQt/Kinetic_pixmaps.C
+++ b/Kinetic_data_structures/src/CGALQt/Kinetic_pixmaps.C
@@ -18,6 +18,8 @@
 //
 // Author(s)     : Daniel Russel <drussel@alumni.princeton.edu>
 
+#include <CGAL/basic.h>
+
 #include <CGAL/Kinetic/basic.h>
 #include <CGAL/Kinetic/IO/internal/pixmaps.h>
 
diff --git a/Nef_S2/src/CGALQt/Qt_widget_OpenGL.C b/Nef_S2/src/CGALQt/Qt_widget_OpenGL.C
index a0a19f573ab..ef7820dedb3 100644
--- a/Nef_S2/src/CGALQt/Qt_widget_OpenGL.C
+++ b/Nef_S2/src/CGALQt/Qt_widget_OpenGL.C
@@ -22,6 +22,8 @@
 // Author(s)     : Michael Seel       <seel@mpi-sb.mpg.de>
 //                 Peter Hachenberger <hachenberger@mpi-sb.mpg.de>
 
+#include <CGAL/basic.h>
+
 #ifdef CGAL_USE_QT
 
 #include <CGAL/IO/Qt_widget_OpenGL.h>
diff --git a/Qt_widget/src/CGALQt/Qt_help_window.C b/Qt_widget/src/CGALQt/Qt_help_window.C
index 327709e7b0c..5095cc7e3f0 100644
--- a/Qt_widget/src/CGALQt/Qt_help_window.C
+++ b/Qt_widget/src/CGALQt/Qt_help_window.C
@@ -21,6 +21,8 @@
 //
 // Author(s)     : Radu Ursu <rursu@sophia.inria.fr
 
+#include <CGAL/basic.h>
+
 #include <CGAL/IO/Qt_help_window.h>
 
 /* XPM */
diff --git a/Qt_widget/src/CGALQt/Qt_widget.C b/Qt_widget/src/CGALQt/Qt_widget.C
index b4be49b2605..ddd87178127 100644
--- a/Qt_widget/src/CGALQt/Qt_widget.C
+++ b/Qt_widget/src/CGALQt/Qt_widget.C
@@ -21,6 +21,8 @@
 //
 // Author(s)     : Laurent Rineau & Radu Ursu
 
+#include <CGAL/basic.h>
+
 #ifdef CGAL_USE_QT
 
 #include <CGAL/Bbox_2.h>
diff --git a/Qt_widget/src/CGALQt/Qt_widget_history.C b/Qt_widget/src/CGALQt/Qt_widget_history.C
index 93fd724ec54..621b5b46280 100644
--- a/Qt_widget/src/CGALQt/Qt_widget_history.C
+++ b/Qt_widget/src/CGALQt/Qt_widget_history.C
@@ -21,6 +21,8 @@
 //
 // Author(s)     : Radu Ursu & Laurent Rineau
 
+#include <CGAL/basic.h>
+
 #ifdef CGAL_USE_QT
 
 #include <CGAL/IO/Qt_widget_history.h>
diff --git a/Qt_widget/src/CGALQt/Qt_widget_layer.C b/Qt_widget/src/CGALQt/Qt_widget_layer.C
index cf235a880d6..51fc83f37a4 100644
--- a/Qt_widget/src/CGALQt/Qt_widget_layer.C
+++ b/Qt_widget/src/CGALQt/Qt_widget_layer.C
@@ -21,6 +21,8 @@
 //
 // Author(s)     : Laurent Rineau & Radu Ursu
 
+#include <CGAL/basic.h>
+
 #ifdef CGAL_USE_QT
 
 #include <CGAL/IO/Qt_widget_layer.h>
diff --git a/Qt_widget/src/CGALQt/Qt_widget_standard_toolbar.C b/Qt_widget/src/CGALQt/Qt_widget_standard_toolbar.C
index 3d1afde16ed..ed627617bed 100644
--- a/Qt_widget/src/CGALQt/Qt_widget_standard_toolbar.C
+++ b/Qt_widget/src/CGALQt/Qt_widget_standard_toolbar.C
@@ -21,6 +21,8 @@
 //
 // Author(s)     : Radu Ursu
 
+#include <CGAL/basic.h>
+
 #ifdef CGAL_USE_QT
 
 #include <CGAL/IO/Qt_widget.h>
diff --git a/Qt_widget/src/CGALQt/Qt_widget_xpm_icons.C b/Qt_widget/src/CGALQt/Qt_widget_xpm_icons.C
index 9f33b0785ab..db78ea63897 100644
--- a/Qt_widget/src/CGALQt/Qt_widget_xpm_icons.C
+++ b/Qt_widget/src/CGALQt/Qt_widget_xpm_icons.C
@@ -21,6 +21,8 @@
 //
 // Author(s)     : Radu Ursu <rursu@geometryfactory.com>
 
+#include <CGAL/basic.h>
+
 
 
 /* XPM */