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-rw-r--r--src/drivers/X11/Fl_X11_Window_Driver.cxx1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/drivers/X11/Fl_X11_Window_Driver.cxx b/src/drivers/X11/Fl_X11_Window_Driver.cxx
index cad3f3c4b..79939410a 100644
--- a/src/drivers/X11/Fl_X11_Window_Driver.cxx
+++ b/src/drivers/X11/Fl_X11_Window_Driver.cxx
@@ -28,6 +28,7 @@
#include <FL/fl_draw.H>
#include <FL/fl_ask.H>
#include <FL/Fl.H>
+#include <FL/x.H>
#include <string.h>
#if HAVE_DLFCN_H
#include <dlfcn.h>