The Gnulib documentation regarding Cygwin and Mac OS X is out-of-date: Cygwin 1.7.x and Mac OS X 10.5 are hardly in use any more.
With these patches, I'm updating it to Cygwin 2.9.0 and Mac OS X 10.13.
Still not the newest (they are from 2017), but better than before.
2020-07-24 Bruno Haible <br...@clisp.org>
doc: Update for Mac OS X 10.13.
* doc/*/*.texi: Update.
* m4/expm1l.m4: Update comments.
* m4/getgroups.m4: Likewise.
* m4/getlogin_r.m4: Likewise.
* m4/linkat.m4: Likewise.
* m4/printf.m4: Likewise.
2020-07-24 Bruno Haible <br...@clisp.org>
doc: Update for Cygwin 2.9.0.
* doc/*/*.texi: Update.
0001-doc-Update-for-Cygwin-2.9.0.patch.gz
Description: application/gzip
0002-doc-Update-for-Mac-OS-X-10.13.patch.gz
Description: application/gzip
