--- addons/allegrogl/include/allegrogl/GLext/glx_ext_defs.h.orig	2008-10-09 19:22:52.000000000 +0200
+++ addons/allegrogl/include/allegrogl/GLext/glx_ext_defs.h	2019-01-23 17:53:44.359602186 +0100
@@ -374,6 +374,10 @@
 #define AGLX_ARB_fbconfig_float
 #define GLX_RGBA_FLOAT_TYPE                0x20B9
 #define GLX_RGBA_FLOAT_BIT                 0x00000004
+#else
+#ifndef GLX_RGBA_FLOAT_BIT
+#define GLX_RGBA_FLOAT_BIT GLX_RGBA_FLOAT_BIT_ARB
+#endif
 #endif
 
 #ifndef GLX_EXT_framebuffer_sRGB