allows a test to be run standalone, now that said directory must
exist before defining $MH_TEST_DIR.
#### outside of make. Requires that MH_OBJ_DIR be set on entry.
#### Use the result of cd and pwd -P so that the result will agree
#### with what getcwd(3) returns.
+test -d "$MH_OBJ_DIR/test/testdir" || mkdir -p "$MH_OBJ_DIR/test/testdir"
test -z "$MH_TEST_DIR" && MH_TEST_DIR=`cd "$MH_OBJ_DIR/test/testdir" && pwd -P`
export MH_TEST_DIR
test -z "$MH_INST_DIR" && MH_INST_DIR="${MH_TEST_DIR}/inst"