From 7997c4bf76e93ce4e916498847fffba46b859a0b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ludovic=20Court=C3=A8s?= <ludo@gnu.org>
Date: Mon, 17 Jun 2013 01:16:24 +0200
Subject: [PATCH] gnu: libpng: Propagate zlib.

* gnu/packages/libpng.scm (libpng): Propagate zlib.
---
 gnu/packages/libpng.scm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/libpng.scm b/gnu/packages/libpng.scm
index 06facc9a9a..32f38194e4 100644
--- a/gnu/packages/libpng.scm
+++ b/gnu/packages/libpng.scm
@@ -37,7 +37,10 @@
             (sha256 (base32
                      "0m3vz3gig7s63zanq5b1dgb5ph12qm0cylw4g4fbxlsq3f74hn8l"))))
    (build-system gnu-build-system)
-   (inputs `(("zlib" ,zlib)))
+
+   ;; libpng.la says "-lz", so propagate it.
+   (propagated-inputs `(("zlib" ,zlib)))
+
    (synopsis "Libpng, a library for handling PNG files")
    (description
     "Libpng is the official PNG (Portable Network Graphics) reference