diff -ru allegro.orig/addons/allegrogl/src/x.c allegro/addons/allegrogl/src/x.c

--- allegro.orig/addons/allegrogl/src/x.c	2018-11-19 12:40:06.000000000 +0300

+++ allegro/addons/allegrogl/src/x.c	2018-11-19 12:50:18.442284039 +0300

@@ -650,7 +650,7 @@

 		return -1;

 	}

-	if (!(render_type & GLX_RGBA_BIT) && !(render_type & GLX_RGBA_FLOAT_BIT)) {

+	if (!(render_type & GLX_RGBA_BIT) && !(render_type & GLX_RGBA_FLOAT_BIT_ARB)) {

 		TRACE(PREFIX_I "decode_fbconfig: Not RGBA mode\n");

 		return -1;

 	}

@@ -674,7 +674,7 @@

 	/* Floating-point depth is not supported as glx extension (yet). */

 	i->float_depth = 0;

-	i->float_color = (render_type & GLX_RGBA_FLOAT_BIT);

+	i->float_color = (render_type & GLX_RGBA_FLOAT_BIT_ARB);

 	v = glXGetVisualFromFBConfig(_xwin.display, fbc);

 	if (!v) {