Source: https://sources.debian.net/src/tvtime/1.0.2-14/debian/patches/libpng.diff

From: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
Date: Mon, 14 May 2012 19:01:31 +0900
Prepares the package for libpng 1.5.  Closes: #650582.

--- tvtime-1.0.2.orig/src/pngoutput.c
+++ tvtime-1.0.2/src/pngoutput.c
@@ -18,5 +18,6 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <zlib.h>
 #include <png.h>
 #include "pngoutput.h" 
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<div class='path'>path: <a href='/guix/log/?id=fe99b7f77e8a67b71ab9db8dee371f42871ea13d'>root</a>/<a href='/guix/log/tests?id=fe99b7f77e8a67b71ab9db8dee371f42871ea13d'>tests</a>/<a href='/guix/log/tests/guix-environment.sh?id=fe99b7f77e8a67b71ab9db8dee371f42871ea13d'>guix-environment.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-environment.sh?id=fe99b7f77e8a67b71ab9db8dee371f42871ea13d&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2018-12-17 23:33:42 +0100'>2018-12-17</span></td><td><a href='/guix/commit/tests/guix-environment.sh?id=a93c1606312e41ffe509977502ce6055f40bc629'>environment: Support package transformation options.</a><span class='msg-avail'>...<span class='msg-tooltip'>Fixes &lt;https://bugs.gnu.org/33776&gt;.
Reported by Adrien Guilbaud &lt;adrien.guilbaud@inria.fr&gt;.

* guix/scripts/environment.scm (show-help): Add call to
'show-transformation-options-help'.
(%options): Add %TRANSFORMATION-OPTIONS.
(options/resolve-packages): Add 'store' parameter.
[transform, package-&gt;manifest-entry*]: New procedures.
Use 'package-&gt;manifest-entry*' instead of 'package-&gt;manifest-entry'.
(guix-environment): Move definition of 'manifest' within 'with-store'.
* tests/guix-environment.sh: Add test.
</span></span></td><td>Ludovic Courtès</td></tr>