This following patch was originally found at the debian mingw-w64 team's
mingw-w64 repo located here:
https://salsa.debian.org/mingw-w64-team/mingw-w64.git

Invoke the following in the aforementioned repo to see the original patch:

  $ git show 4974e2c:debian/patches/reproducible-gendef.patch

Description: Drop __DATE__ from gendef
Author: Stephen Kitt <skitt@debian.org>

This allows gendef to be built reproducibly.

--- a/mingw-w64-tools/gendef/src/gendef.c
+++ b/mingw-w64-tools/gendef/src/gendef.c
@@ -196,7 +196,6 @@
                    "  By default, the output files are named after their DLL counterparts\n"
                    "  gendef MYDLL.DLL     Produces MYDLL.def\n"
                    "  gendef - MYDLL.DLL   Prints the exports to stdout\n");
-  fprintf (stderr, "\nBuilt on %s\n", __DATE__);
   fprintf (stderr, "\nReport bugs to <mingw-w64-public@lists.sourceforge.net>\n");
   exit (0);
 }
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<div class='path'>path: <a href='/guix/log/?id=a13b522078a02b6df7f0494c0bd0ecec0e476e73'>root</a>/<a href='/guix/log/TODO?id=a13b522078a02b6df7f0494c0bd0ecec0e476e73'>TODO</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/TODO?id=a13b522078a02b6df7f0494c0bd0ecec0e476e73&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2019-01-21 09:59:41 +0100'>2019-01-21</span></td><td><a href='/guix/commit/TODO?id=b93d2602f72dbbd9334a4f5c75b8721e1f2fa35a'>Update 'TODO'</a><span class='msg-avail'>...<span class='msg-tooltip'>* TODO (Installer): Add Pierre Neidhardt suggestions described here:
  https://lists.gnu.org/archive/html/guix-devel/2019-01/msg00305.html
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2019-01-17 14:11:15 +0100'>2019-01-17</span></td><td><a href='/guix/commit/TODO?id=11b68c90cd89288906c595d5c31a0413ed8a496f'>Update 'TODO'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* TODO (Installer): New section.
</span></span></td><td>Mathieu Othacehe</td></tr>
<tr><td><span title='2016-09-01 14:57:03 +0200'>2016-09-01</span></td><td><a href='/guix/commit/TODO?id=e5cd149f681cc8d285da6c7638b70a43b333f337'>Update 'TODO'.</a><span class='msg-avail'>...<span class='msg-tooltip'>* TODO: Remove items about guix challenge &amp; guix publish.

Signed-off-by: Vincent Legoll &lt;vincent.legoll@gmail.com&gt;
Signed-off-by: Ludovic Courtès &lt;ludo@gnu.org&gt;
</span></span></td><td>Vincent Legoll</td></tr>
a11629aa12b833ca941a3a996c3db2754a7a
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-12-12 23:30:52 +0100'>2024-12-12</span></td><td><a href='/guix/commit/etc/manifests?id=98aca7a2b6250e7f6a2ff3a93b29d0dea896ad21'>etc: upgrade: Attempt to upgrade the latest libgit2, not the default one.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/manifests/upgrade.scm (security-packages): Use
‘specification-&gt;package’ for libgit2.

Change-Id: I6901ff6d40c645b292aab4779acf1c0547fdc024
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-12-12 23:23:34 +0100'>2024-12-12</span></td><td><a href='/guix/commit/etc/manifests?id=5e2daf4b10cdbb7b5b3a7b1a49b0dfdba4346748'>maint: Add ungrafting manifest.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/manifests/ungraft.scm: New file.
* Makefile.am (EXTRA_DIST): Add it.

Change-Id: If4aa7649721b93d3297ecd967d5db4a6b71ec6eb
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2024-12-12 23:23:33 +0100'>2024-12-12</span></td><td><a href='/guix/commit/etc/manifests?id=12d00767f036029f1f5738de644d4972db374f4f'>etc: Move manifests to a separate directory.</a><span class='msg-avail'>...<span class='msg-tooltip'>* etc/disarchive-manifest.scm, etc/hurd-manifest.scm,
etc/kernels-manifest.scm, etc/release-manifest.scm,
etc/source-manifest.scm, etc/system-tests.scm,
etc/time-travel-manifest.scm, etc/upgrade-manifest.scm: Move to…
* etc/manifests: … here, and drop “-manifest” from file name.
* Makefile.am (EXTRA_DIST, assert-binaries-available, check-system):
Adjust accordingly.

Change-Id: Iedee3d0cdd42e72ef8bbf654ea5d3b47dca95874
</span></span></td><td>Ludovic Courtès</td></tr>