The compression utility dictzip writes the compressed file's mtime in a header
of the compressed file. No command-line switch is documented to control or
suppress this behavior. This makes the build of packages relying on
freedict-tools such as freedict-dictionaries non-deterministic.

This patch sets the mtime of the .dict file to be compressed by dictzip to the
start of the epoch on the Greenwich meridian, restoring build determinism.

diff --git a/mk/dicts.mk b/mk/dicts.mk
index 08e8923..e671cf3 100644
--- a/mk/dicts.mk
+++ b/mk/dicts.mk
@@ -265,7 +265,8 @@ $(BUILD_DICTD)/%.dict $(BUILD_DICTD)/%.index: $(BUILD_DICTD)/%.c5 query-dictd
 		dictfmt --without-time -t --headword-separator %%% $(DICTFMTFLAGS) $* < $(notdir $<)
 
 $(BUILD_DICTD)/%.dict.dz: $(BUILD_DICTD)/%.dict
-	dictzip -k $<
+	touch -m -d "$$(date -u -R -d @0)" $< && \
+		dictzip -k $<
 
 # prevent make from removing our precious file
 .PRECIOUS: $(BUILD_DICTD)/$(dictname).dict
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<div class='path'>path: <a href='/guix/log/?id=73b0b298bf9d4a99709b2cd8cb016d7537586ab1'>root</a>/<a href='/guix/log/bootstrap?id=73b0b298bf9d4a99709b2cd8cb016d7537586ab1'>bootstrap</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/bootstrap?id=73b0b298bf9d4a99709b2cd8cb016d7537586ab1&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2021-06-13 20:46:01 +0200'>2021-06-13</span></td><td><a href='/guix/commit/bootstrap?id=bd02e50a02ceed914135dba1e69e4457e489cf86'>bootstrap: Simplify search for translation languages.</a><span class='msg-avail'>...<span class='msg-tooltip'>Extend the sed script to also behave like "basename",
saving the addtional call of "xargs basename".

* bootstrap (langs): Extend sed scripts, remove running xargs.
</span></span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2020-02-17 11:49:08 +0100'>2020-02-17</span></td><td><a href='/guix/commit/bootstrap?id=3dd311e3a059131ef245417106d4fb659222ef3c'>bootstrap: Fix typo.</a><span class='msg-avail'>...<span class='msg-tooltip'>* bootstrap: Substitute ‘guix-cookbook’ for copy/pasted ‘guix-manual’.

Reported-by: jetomit on #guix
</span></span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2019-09-18 11:38:14 +0200'>2019-09-18</span></td><td><a href='/guix/commit/bootstrap?id=7bc46ecc34ceb042ff890e5d306d0a2a736e891d'>doc: Add Guix Cookbook.</a><span class='msg-avail'>...<span class='msg-tooltip'>* .gitignore: Update ignore list.
* Makefile.am (assert-no-store-file-names): Exclude the cookbook.
* bootstrap: Generate po files for cookbook translations.
* doc/guix-cookbook.texi: New file.
* doc/local.mk (info_TEXINFOS): Add it; add a rule to build cookbook
translations.
* po/doc/local.mk (DOC_COOKBOOK_PO_FILES): New variable.
(EXTRA_DIST): Add cookbook pot file and po files.
(doc-po-update-cookbook-%): New target.
(doc-pot-update): Also update cookbook pot file.
(doc-po-update): Also update cookbook po files.
</span></span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2019-04-26 11:21:32 +0200'>2019-04-26</span></td><td><a href='/guix/commit/bootstrap?id=9ca5ff882e2ac4eaab02eb0fde545bd784af478b'>bootstrap: Break automake dependency on generated files.</a><span class='msg-avail'>...<span class='msg-tooltip'>* bootstrap: Generate stub files for the manual translations whose
generated files are not included in the VCS.
* doc/contributing.de.texi: Remove file.
* doc/contributing.es.texi: Remove file.
* doc/contributing.fr.texi: Remove file.
* doc/contributing.zh_CN.texi: Remove file.
* doc/guix.de.texi: Remove file.
* doc/guix.es.texi: Remove file.
* doc/guix.fr.texi: Remove file.
* doc/guix.zh_CN.texi: Remove file.
* .gitignore: Add them.

Signed-off-by: Julien Lepiller &lt;julien@lepiller.eu&gt;
</span></span></td><td>Miguel Ángel Arruga Vivas</td></tr>