If we omit this, groff 1.23.0 warns:

  tbl preprocessor failed, or it or soelim was not run; table(s) likely
  not rendered (TE macro called with TW register undefined)

Reported-by: Lucas Nussbaum <lu...@debian.org>
Reported-at: https://bugs.debian.org/1042358
Signed-off-by: Colin Watson <cjwat...@ubuntu.com>
---
 Makefile.am | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile.am b/Makefile.am
index db341504d..265cf0a7b 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -368,7 +368,7 @@ ALL_LOCAL += manpage-check
 manpage-check: $(man_MANS) $(dist_man_MANS) $(noinst_man_MANS)
        @error=false; \
        for manpage in $?; do \
-         LANG=en_US.UTF-8 groff -w mac -w delim -w escape -w input -w missing 
-w tab -T utf8 -man -p -z $$manpage >$@.tmp 2>&1; \
+         LANG=en_US.UTF-8 groff -t -w mac -w delim -w escape -w input -w 
missing -w tab -T utf8 -man -p -z $$manpage >$@.tmp 2>&1; \
          if grep warning: $@.tmp; then error=:; fi; \
          rm -f $@.tmp; \
        done; \
-- 
2.40.1

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