gzip includes the name of the uncompressed file and its modification
timestamp into the compressed archive. The latter makes it hard to
reproduce the generated files bit for bit at a later time, so omit this
information from the archive using the "--no-name" option. This is a
reproducibility best practice, see
https://wiki.debian.org/ReproducibleBuilds/TimestampsInGzipHeaders
---
 doc/Makefile.local | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doc/Makefile.local b/doc/Makefile.local
index 769438ed..19b953ed 100644
--- a/doc/Makefile.local
+++ b/doc/Makefile.local
@@ -40,7 +40,7 @@ INFO_INFO_FILES := $(INFO_TEXI_FILES:.texi=.info)
 .PHONY: install-man build-man apidocs install-apidocs
 
 %.gz: %
-       rm -f $@ && gzip --stdout $^ > $@
+       rm -f $@ && gzip --no-name --stdout $^ > $@
 
 ifeq ($(WITH_EMACS),1)
 $(DOCBUILDDIR)/.roff.stamp sphinx-html sphinx-texinfo: docstring.stamp
-- 
2.27.0
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