$OpenBSD: patch-vcl_Executable_vcldemo_mk,v 1.2 2015/09/29 16:10:48 robert Exp $
--- vcl/Executable_vcldemo.mk.orig.port	Thu Sep 17 15:33:12 2015
+++ vcl/Executable_vcldemo.mk	Sun Sep 27 12:18:17 2015
@@ -46,10 +46,10 @@ $(eval $(call gb_Executable_use_static_libraries,vclde
     vclmain \
 ))
 
-ifeq ($(OS),LINUX)
+ifneq (,$(filter LINUX OPENBSD,$(OS)))
 $(eval $(call gb_Executable_add_libs,vcldemo,\
 	-lm \
-	-ldl \
+	$(if $(filter LINUX,$(OS)),-ldl) \
 	-lpthread \
     -lGL \
     -lX11 \
