wsjtx uses a version of the hamlib CAT control library. This library is virtually identical to the current release version of hamlib. If a wsjtx user wishes to use the hamlib TS-2000 emulator rigctlcom to allow CAT applications that do not talk to hamlib to share CAT control control their transceiver; then this special version of rigctlcom should be used since that too has the modified hamlib code embedded with it.
WSJT-X home page
WSJT-X User’s Guide
Refer to the hamlib documentation.