gentoo-overlay/games-emulation/sdlmame/files/sdlmame-0.144-no-opengl.patch

--- ./src/osd/sdl/osdsdl.h.orig
+++ ./src/osd/sdl/osdsdl.h
@@ -225,6 +225,8 @@
 	const char *audio_driver() const { return value(SDLOPTION_AUDIODRIVER); }
 #if USE_OPENGL
 	const char *gl_lib() const { return value(SDLOPTION_GL_LIB); }
+#else
+	const char *gl_lib() const { return NULL; }
 #endif
 
 private: