add missing #include for gtk version check

diff --git a/src/widgets/sp-color-slider.cpp b/src/widgets/sp-color-slider.cpp
index bac3de0e05d18cd4c99293dd5df7f0c24c39eff0..0f792edff3bd43f1a13579e59811ea725a15c07c 100644 (file)
--- a/src/widgets/sp-color-slider.cpp
+++ b/src/widgets/sp-color-slider.cpp
@@ -12,6 +12,7 @@
  * This code is in public domain
  */
 
+#include <gtk/gtkversion.h>
 #include <gtk/gtksignal.h>
 #include "sp-color-scales.h"