Re: groff 1.23.0.rc4 on BSD-like systems

[Bruno Haible]

On the systems
  - Alpine Linux
  - macOS
  - FreeBSD
  - NetBSD
  - OpenBSD
  - Cygwin
the "make check" part of the build fails, trying to generate the file
contrib/mom/examples/tests-mom.sh . For example:

$ make check
...
make  check-TESTS
make[2]: Entering directory '/home/bruno/groff-1.23.0.rc4/build-64'
make[3]: Entering directory '/home/bruno/groff-1.23.0.rc4/build-64'
FAIL: contrib/gdiffmk/tests/runtests.sh
  GEN      contrib/hdtbl/examples/test-hdtbl.sh
SKIP: contrib/hdtbl/examples/test-hdtbl.sh
PASS: contrib/mm/tests/LT_SP_AU_without_AT_works.sh
PASS: contrib/mm/tests/LT_SP_multi-word_LO_SJ_works.sh
PASS: contrib/mm/tests/MT-1-reports-all-TM-numbers.sh
PASS: contrib/mm/tests/MT_5_includes_AT_in_SG.sh
PASS: contrib/mm/tests/P-indentation-works.sh
PASS: contrib/mm/tests/ms_cover_sheet_robust_to_missing_AF.sh
PASS: contrib/mm/tests/mse_has-sufficient-footnote-space.sh
PASS: contrib/mm/tests/place-equation-labels-correctly-in-displays.sh
PASS: contrib/mm/tests/remove-stale-bib-entry-data.sh
PASS: contrib/mm/tests/short-pages-do-not-overflow-stack.sh
  GEN      contrib/mom/examples/tests-mom.sh
/bin/sh: can't create contrib/mom/examples/tests-mom.sh: nonexistent directory
make[3]: *** [Makefile:14129: contrib/mom/examples/tests-mom.sh] Error 1

The directory contrib/mom/ exists. The directory contrib/mom/examples/
does not exist. What's missing is therefore obviously a command
  $(MKDIR_P) contrib/mon/examples
in the contrib/mom/examples/tests-mom.sh rule. In file contrib/mom/mom.am,
between lines 116 and 117.

Bruno