Cygwin patch from Patrick Staehlin:

To compile the development CVS version of FlightGear(0.9.0) i had to
apply some small changes to SimGear and FlightGear.

The changes need probably some additional ifdefs for other platforms but
since my linux-hd crashed i can't verify that.

simgear/scene/sky/clouds3d/SkyContext.hpp

@@ -28,14 +28,12 @@
 
 // warning for truncation of template name for browse info
 // #pragma warning( disable : 4786)
-
 #include "SkySingleton.hpp"
-
+#include "compiler.h"
-
 #include <list>
 #include <map>
 #include <algorithm>
-
+#include "compiler.h"
 #ifdef WIN32
 # include "extgl.h"
 #else

simgear/scene/sky/clouds3d/SkyTexture.hpp

@@ -25,6 +25,10 @@
 
 // #pragma warning( disable : 4786 )
 
+#define __glext_h_
+#define __GLEXT_H_
+#define __glext_h_
+#define __GLEXT_H_
 #include <GL/glut.h>
 
 //------------------------------------------------------------------------------

simgear/scene/sky/clouds3d/SkyTextureState.cpp

@@ -24,6 +24,8 @@
 #include "SkyTextureState.hpp"
 //#include "glvu.hpp"
 
+
+
 //------------------------------------------------------------------------------
 // Static initializations.
 //------------------------------------------------------------------------------

simgear/scene/sky/clouds3d/extgl.h

@@ -24,6 +24,12 @@
 #include <windows.h>
 #endif
 
+#define __glext_h_
+#define __GLEXT_H_
+
+#define __glext_h_
+#define __GLEXT_H_
+
 #include <GL/gl.h>
 
 #ifndef APIENTRY