$OpenBSD$
--- configure.ac.orig	Sun Mar 28 06:52:28 2010
+++ configure.ac	Tue Oct 18 19:40:00 2011
@@ -57,12 +57,12 @@ if test x$disable_sdl = xno ; then
     )
 fi
 
-if test x$have_sdl_lib = xyes ; then
-    AC_DEFINE(C_USE_SDL)
+#if test x$have_sdl_lib = xyes ; then
+    #AC_DEFINE(C_USE_SDL)
     # Don't need SDLmain since we're a library
-    LIBS="$LIBS ${SDL_LIBS/-lSDLmain/}"
-    CPPFLAGS="$CPPFLAGS $SDL_CFLAGS -I/usr/include"
-fi
+    #LIBS="$LIBS ${SDL_LIBS/-lSDLmain/}"
+    #CPPFLAGS="$CPPFLAGS $SDL_CFLAGS -I/usr/include"
+#fi
 
 dnl The target cpu checks
 AH_TEMPLATE(HAVE_MMX,[Define if you have mmx support])
@@ -111,6 +111,11 @@ case "$host" in
         fi
         ;;
     *netbsd*)
+	;;
+    *openbsd*)
+	osflag="__linux__"
+	CXXFLAGS="$CXXFLAGS -D__unix__ -D$osflag -I\$(top_srcdir)/platform/linux $X_CFLAGS"
+	LIBS="$LIBS -lGL -lGLU"
         ;;
     *qnx*)
         ;;