+
+## The location of installed nmhetcdir is, for all purposes except
+## distcheck, $nmhetcdir. For distcheck, prepend $MH_INST_DIR (from
+## test/common.sh.in), which is based on $MH_TEST_DIR (from
+## $TESTS_ENVIRONMENT).
+DISTCHECK_CONFIGURE_FLAGS = DISABLE_SETGID_MAIL=1 \
+ NMHETCDIRINST='$${abs_builddir}/test/testdir/inst'