--- drd/drd_main.c.orig
+++ drd/drd_main.c
@@ -739,7 +739,7 @@
 
 static void DRD_(post_clo_init)(void)
 {
-#if defined(VGO_linux) || defined(VGO_darwin) || defined(VGO_solaris) || defined(VGO_freebsd)
+#if defined(VGO_linux) || defined(VGO_darwin) || defined(VGO_solaris) || defined(VGO_freebsd) || defined(VGO_openbsd)
    /* fine */
 #else
    VG_(printf)("\nWARNING: DRD has not yet been tested on this operating system.\n\n");