https://github.com/exploitagency/vanitygen_z
make oclvanitygen_z
./oclvanitygen_z t1Test -i
Difficulty: 284595
Pattern: t1Test
Address: t1TESt1bwpTm7fVTTTji2HDqzF7byKjG9o7
Privkey: 5JNoXQqZ5S2zK7f4KworhRUDeaus8EtFs5gvn8uu93hv2yfjRCm
./zcash-cli importprivkey 5JNoXQqZ5S2zK7f4KworhRUDeaus8EtFs5gvn8uu93hv2yfjRCm
./zcash-cli getaddressesbyaccount ""
[
"t1TESt1bwpTm7fVTTTji2HDqzF7byKjG9o7",
]
Its still fairly buggy as is the original source so if it doesnt seem to be generating addresses test the 3rd character by itself first and see if you get errors, its the hash mismatching error creeping up. Also be sure to test any output first before actually using it!