I thought it useful to see which base components use libucl - which you can find in the source tree under 'contrib'. Here are some of those components ...
- ctld
- bhyvectl
- bhyve
- flua
- iovctl
- local-unbound
- mandoc
- pkg
Code:
LIBADD+= ucl
CFLAGS+= -I${SRCTOP}/contrib/libucl/include