Do not introduce timestamps in PNG files (for icons).
See <https://wiki.debian.org/ReproducibleBuilds/TimestampsInPNG>.

--- awesome-3.4.15/CMakeLists.txt	2013-02-11 14:50:21.000000000 +0100
+++ awesome-3.4.15/CMakeLists.txt	2016-06-16 13:59:30.528125439 +0200
@@ -295,7 +295,7 @@ macro(a_icon_convert match replacement i
         set(ALL_ICONS ${ALL_ICONS} ${output})
 
         add_custom_command(
-            COMMAND ${CONVERT_EXECUTABLE} ${input} -strip ${ARGN} ${output}
+            COMMAND ${CONVERT_EXECUTABLE} +set date:create +set date:modify -define png:exclude-chunk=time ${input} -strip ${ARGN} ${output}
             OUTPUT  ${output}
             DEPENDS ${input}
             VERBATIM)
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<tr><td><span title='2021-07-23 14:36:00 +0200'>2021-07-23</span></td><td><a href='/guix/commit/gnu/packages/patches/binutils-mingw-w64-timestamp.patch?id=3f7efaa54accd39d2b8d75014634a3daa9d2fac9'>gnu: binutils: Update binutils patch for mingw.</a><span class='msg-avail'>...<span class='msg-tooltip'>This allows "./pre-inst-env guix build hello --target=x86_64-w64-mingw32"
to succeed.  The binary can be run successfully under wine.

* gnu/packages/patches/binutils-mingw-w64-timestamp.patch:
  Update to the current version in Debian.

Signed-off-by: Mathieu Othacehe &lt;othacehe@gnu.org&gt;
</span></span></td><td>Maxime Devos</td></tr>
<tr><td><span title='2020-04-10 16:02:51 +0200'>2020-04-10</span></td><td><a href='/guix/commit/gnu/packages/patches/binutils-mingw-w64-timestamp.patch?id=523280e0993cf8bd6190c729e9cd18be52b73ab5'>gnu: binutils: Shorten file names of MinGW patches.</a><span class='msg-avail'>...<span class='msg-tooltip'>This ensures we stay below the POSIX tar file name length limit.

* gnu/packages/patches/binutils-mingw-w64-reproducible-import-libraries.patch:
Rename to...
* gnu/packages/patches/binutils-mingw-w64-deterministic.patch: ... this.
* gnu/packages/patches/binutils-mingw-w64-specify-timestamp.patch:
Rename to...
* gnu/packages/patches/binutils-mingw-w64-timestamp.patch: ... this.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
* gnu/packages/cross-base.scm (cross-binutils): Likewise.
</span></span></td><td>Ludovic Courtès</td></tr>