+sc_prohibit_leading_TABs:
+ if test -d .git; then \
+ git grep -l '^ * ' lib m4 tests \
+ | grep -Ev '^lib/reg|Makefile|test-update-copyright' \
+ | grep . \
+ && { printf '*** %s\n' 'indent with spaces, not TABs;' \
+ 1>&2; exit 1; } || : \
+ else :; fi
+