Hans FUGAL: mac compilation fix

diff --git a/src/Instrumentation/render_area_2d.cxx b/src/Instrumentation/render_area_2d.cxx
index e1ebbeda4543184899b49f9e8e4f3d17f6786078..d0dbdf6e18b522e2c116e4b4dd120c1693ff774c 100644 (file)
--- a/src/Instrumentation/render_area_2d.cxx
+++ b/src/Instrumentation/render_area_2d.cxx
@@ -30,10 +30,10 @@
 #   include <windows.h>
 #endif
 
-#include <GL/gl.h>
-
 #include "render_area_2d.hxx"
 
+#include SG_GL_H
+
 
 static const float dummy_normals[][3] = {{0.0f, 0.0f, 0.0f},
                                          {0.0f, 0.0f, 0.0f},