Allow a user to enable setgid of inc when running distcheck with:

  make distcheck DISTCHECK_CONFIGURE_FLAGS=DISABLE_SETGID_MAIL=0
though that's probably never going to be used.
(cherry picked from commit b83b264039d4245810cb845a540c024032a45ac4)

diff --git a/configure.ac b/configure.ac
index 5e9cae2..70490ca 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -364,7 +364,7 @@ fi
 
 dnl Provide a way for distcheck to disable setgid_mail via
 dnl DISTCHECK_CONFIGURE_FLAGS.
-if test x"$DISABLE_SETGID_MAIL" != x; then
+if test x"$DISABLE_SETGID_MAIL" != x -a x"$DISABLE_SETGID_MAIL" != x0; then
   nmh_cv_dotlockfile_setgid=yes
 fi