$NetBSD: patch-dpf_examples_ExternalUI_Makefile,v 1.1 2022/04/06 16:32:21 nia Exp $

Only use libdl on Linux.

--- dpf/examples/ExternalUI/Makefile.orig	2020-07-18 12:07:33.000000000 +0000
+++ dpf/examples/ExternalUI/Makefile
@@ -24,7 +24,7 @@ FILES_UI  = \
 UI_TYPE = external
 include ../../Makefile.plugins.mk
 
-ifneq ($(HAIKU),true)
+ifeq ($(LINUX),true)
 LINK_FLAGS += -ldl
 endif