contrib: build libpng only if needed

1c398c43 · Rémi Denis-Courmont · 130f1b7b · 1c398c43
Commit 1c398c43 authored Jul 04, 2011 by Rémi Denis-Courmont
--- a/contrib/src/png/rules.mak
+++ b/contrib/src/png/rules.mak
@@ -3,6 +3,9 @@ PNG_VERSION := 1.4.7
 PNG_URL := $(SF)/libpng/libpng-$(PNG_VERSION).tar.bz2

 PKGS += png
+ifeq ($(call need_pkg,"libpng"),)
+PKGS_FOUND += png
+endif

 $(TARBALLS)/libpng-$(PNG_VERSION).tar.bz2:
 	$(call download,$(PNG_URL))