a variety of fixes for MingW

include/GL/glu.h

@@ -44,6 +44,19 @@
 #define GLAPIENTRYP GLAPIENTRY *
 #endif
 
+#ifdef GLAPI
+#undef GLAPI
+#endif
+
+#  if (defined(_MSC_VER) || defined(__MINGW32__)) && defined(BUILD_GLU32)
+#    define GLAPI __declspec(dllexport)
+#  elif (defined(_MSC_VER) || defined(__MINGW32__)) && defined(_DLL) /* tag specifying we're building for DLL runtime support */
+#    define GLAPI __declspec(dllimport)
+#  else /* for use with static link lib build of Win32 edition only */
+#    define GLAPI extern
+#  endif /* _STATIC_MESA support */
+
+
 #ifndef GLAPI
 #define GLAPI
 #endif

include/GL/glut.h

@@ -115,7 +115,7 @@ extern _CRTIMP void __cdecl exit(int);
 #endif
 
 /* GLUT API entry point declarations for Win32. */
-#if defined(GLUT_BUILDING_LIB) && defined(_DLL)
+#if (defined(BUILD_GLUT32) || defined(GLUT_BUILDING_LIB)) && defined(_DLL)
 # 	define GLUTAPI __declspec(dllexport)
 #elif defined(_DLL)
 #   define GLUTAPI __declspec(dllimport)
@@ -131,8 +131,10 @@ extern _CRTIMP void __cdecl exit(int);
 #	endif
 #	define CALLBACK __stdcall
 typedef int (GLUTAPIENTRY *PROC)();
-typedef void *HGLRC;
-typedef void *HDC;
+#if !defined(__MINGW32__)
+	typedef void *HGLRC;
+	typedef void *HDC;
+#endif
 typedef unsigned long COLORREF;
 #endif