fgpanel: fix compile for OSX

utils/fgpanel/FGGLApplication.cxx

@@ -21,12 +21,19 @@
 #endif
 
 #include "FGGLApplication.hxx"
+#include <simgear/compiler.h>
+
 #ifdef HAVE_WINDOWS_H
 #include <windows.h>
 #define snprintf sprintf_s
 #endif
+#if defined (SG_MAC)
+#include <OpenGL/gl.h>
+#include <GLUT/glut.h>
+#else
 #include <GL/gl.h>
 #include <GL/glut.h>
+#endif
 
 #include <iostream>
 #include <exception>

utils/fgpanel/FGPNGTextureLoader.cxx

@@ -22,7 +22,11 @@
 #endif
 #include "FGPNGTextureLoader.hxx"
 
-#include <GL/glu.h>
+#if defined (SG_MAC)
+#include <GLUT/glut.h>
+#else
+#include <GL/glut.h>
+#endif
 #include <png.h>
 #include <stdio.h>
 #include <stdlib.h>

utils/fgpanel/FGPanelApplication.cxx

@@ -26,8 +26,13 @@
 
 #include "FGGLApplication.hxx"
 #include "FGPanelApplication.hxx"
+#if defined (SG_MAC)
+#include <OpenGL/gl.h>
+#include <GLUT/glut.h>
+#else
 #include <GL/gl.h>
 #include <GL/glut.h>
+#endif
 
 #include <simgear/math/SGMisc.hxx>
 #include <simgear/misc/sg_path.hxx>

utils/fgpanel/FGRGBTextureLoader.cxx

@@ -26,8 +26,13 @@
 #endif
 
 #include "FGRGBTextureLoader.hxx"
+#if defined (SG_MAC)
+#include <OpenGL/gl.h>
+#include <GLUT/glut.h>
+#else
 #include <GL/gl.h>
-#include <GL/glu.h>
+#include <GL/glut.h>
+#endif
 
 #include <stdio.h>
 #include <stdlib.h>

utils/fgpanel/FGTextureLoaderInterface.hxx

@@ -17,8 +17,12 @@
 //
 #ifndef __FGTEXTURELOADERINTERFACE_HXX
 #define __FGTEXTURELOADERINTERFACE_HXX
-
+#include <simgear/compiler.h>
+#if defined (SG_MAC)
+#include <OpenGL/gl.h>
+#else
 #include <GL/gl.h>
+#endif
 #include <string>
 class FGTextureLoaderInterface {
 public:

utils/fgpanel/panel.cxx

@@ -31,7 +31,11 @@
 
 #include <simgear/compiler.h>
 
+#if defined (SG_MAC)
+#include <GLUT/glut.h>
+#else
 #include <GL/glut.h>
+#endif
 
 #include <plib/fnt.h>