diff --git a/gfx/glsym/glgen.py b/gfx/glsym/glgen.py
index 2ee1a4b1f1..6380a028a3 100755
--- a/gfx/glsym/glgen.py
+++ b/gfx/glsym/glgen.py
@@ -83,6 +83,12 @@ if __name__ == '__main__':
       f.write('#ifdef GL_APIENTRY\n')
       f.write('typedef void (GL_APIENTRY *RGLGENGLDEBUGPROC)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, GLvoid*);\n')
       f.write('#else\n')
+      f.write('#ifndef APIENTRY\n')
+      f.write('#define APIENTRY\n')
+      f.write('#endif\n')
+      f.write('#ifndef APIENTRYP\n')
+      f.write('#define APIENTRYP APIENTRY *\n')
+      f.write('#endif\n')
       f.write('typedef void (APIENTRY *RGLGENGLDEBUGPROCARB)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, GLvoid*);\n')
       f.write('typedef void (APIENTRY *RGLGENGLDEBUGPROC)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, GLvoid*);\n')
       f.write('#endif\n')
diff --git a/gfx/glsym/glsym_gl.h b/gfx/glsym/glsym_gl.h
index f7e3a96506..2026c9d3d4 100644
--- a/gfx/glsym/glsym_gl.h
+++ b/gfx/glsym/glsym_gl.h
@@ -3,6 +3,12 @@
 #ifdef GL_APIENTRY
 typedef void (GL_APIENTRY *RGLGENGLDEBUGPROC)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, GLvoid*);
 #else
+#ifndef APIENTRY
+#define APIENTRY
+#endif
+#ifndef APIENTRYP
+#define APIENTRYP APIENTRY *
+#endif
 typedef void (APIENTRY *RGLGENGLDEBUGPROCARB)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, GLvoid*);
 typedef void (APIENTRY *RGLGENGLDEBUGPROC)(GLenum, GLenum, GLuint, GLenum, GLsizei, const GLchar*, GLvoid*);
 #endif