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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<div class='path'>path: <a href='/guix/log/?id=e56ab46ba001504d64af37a3fe945fa6ead3492e'>root</a>/<a href='/guix/log/gnu?id=e56ab46ba001504d64af37a3fe945fa6ead3492e'>gnu</a>/<a href='/guix/log/gnu/packages?id=e56ab46ba001504d64af37a3fe945fa6ead3492e'>packages</a>/<a href='/guix/log/gnu/packages/idris.scm?id=e56ab46ba001504d64af37a3fe945fa6ead3492e'>idris.scm</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/gnu/packages/idris.scm?id=e56ab46ba001504d64af37a3fe945fa6ead3492e&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2020-03-09 16:01:18 +0100'>2020-03-09</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=17dea2e2798574d8bae4fc27a74cd694c6f9155c'>gnu: idris: Use HTTPS home page.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-11-20 20:48:50 -0500'>2019-11-20</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=3594b6699d3043029f85fda2ccd82da1ae17e61b'>gnu: idris: Fix Cabal dependency constraints.</a><span class='msg-avail'>...</span></td><td>Timothy Sample</td></tr>
<tr><td><span title='2019-11-20 20:48:22 -0500'>2019-11-20</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=03b0c92e2a75c73204791fa28858e0de21856c14'>gnu: ghc-megaparsec: Update to 7.0.5.</a><span class='msg-avail'>...</span></td><td>Timothy Sample</td></tr>
<tr><td><span title='2019-11-20 20:48:20 -0500'>2019-11-20</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=d44732025e286fde4cba6b86d69b0968a3fe9c03'>gnu: ghc-network: Update to 2.8.0.1.</a><span class='msg-avail'>...</span></td><td>Timothy Sample</td></tr>
<tr><td><span title='2019-09-24 21:15:24 -0500'>2019-09-24</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=4780db2c935110ea3254817ba0c519c229b9461e'>gnu: idris: Update to 1.3.2.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2019-08-31 09:25:49 -0400'>2019-08-31</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=dddbc90c648a569ed3f6dcf8678cb94e63a8302f'>gnu: Move non-compilers out of haskell.scm.</a><span class='msg-avail'>...</span></td><td>Robert Vollmert</td></tr>
<tr><td><span title='2019-08-07 22:05:29 -0400'>2019-08-07</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=a1eb8be8ca1a0a4c952f264f8846b67a32db0ec8'>gnu: Remove ghc-parsec, ghc-stm, ghc-text, ghc-xhtml.</a><span class='msg-avail'>...</span></td><td>Robert Vollmert</td></tr>
<tr><td><span title='2019-04-11 19:34:01 -0500'>2019-04-11</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=89647ff1d4abc4674973392cb7e08d14898e3ac9'>gnu: idris: Run tests.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2019-04-11 19:34:01 -0500'>2019-04-11</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=e16bc71015a2cc59f49e27720c0a93bc4188ed81'>gnu: idris: Enable FFI and GMP support.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>
<tr><td><span title='2019-04-11 19:34:00 -0500'>2019-04-11</span></td><td><a href='/guix/commit/gnu/packages/idris.scm?id=a4df9ba4ec4def25232265d72722dcc348b9beb0'>gnu: idris: Upgrade to 1.3.1.</a><span class='msg-avail'>...</span></td><td>Eric Bavier</td></tr>