test -z "$MH_INST_DIR" && MH_INST_DIR="${MH_TEST_DIR}/inst"
export MH_INST_DIR
-unset MHBUILD MHCONTEXT MHMTSUSERCONF MHN MHSHOW MHSTORE
+unset MAILDROP MHBUILD MHCONTEXT MHMTSUSERCONF MHN MHSHOW MHSTORE
unset MHLDEBUG MHPDEBUG MHWDEBUG PAGER
#### Set LC_ALL in individual tests as needed. Unset these so
#### that we don't depend on user's settings in other tests.