Linking to an external library in 6.6 app?

[yeahthisismyname]

I'm working on a an app in 6.6, and need to link against external libraries (ftdi and libusb.) I'm not sure exactly where to add this, since the CMakeLists.txt for apps now just call add_cfe_app, so I can't target_link_libraries, and add_library just adds a target and doesn't actually add anything to link it. Is there a recommended method to go about this?

[yeahthisismyname]

Actually, just sending this over to the mailing list, it looks like it's used a lot more than the github discussions.