--- ext/gl/mkrf_conf_save.rb	Tue Mar 31 15:26:00 2009
+++ ext/gl/mkrf_conf.rb	Mon Mar 30 19:26:46 2009
@@ -27,6 +27,9 @@
 	when /mswin32/
 		g.cflags << ' -DWIN32' + RUBYVER
 		g.include_library( 'opengl32.lib', 'glVertex3d')
+	when /mingw/
+		g.cflags << ' -DWIN32' + RUBYVER
+		g.include_library( 'opengl32', 'glVertex3d')
 	else
 		g.cflags << ' -Wall' + RUBYVER
 		g.include_library( 'GL', 'glVertex3d')