port x11-toolkits/libdecor installed port built /usr/local/lib/libdecor-0.so /usr/local/lib/libdecor-0.so.0 /usr/local/lib/libdecor-0.so.0.100.1 port /devel/sdl20 libdecor.so maybe mislabeled caused the dependency not to be met for given libdecor config selection cp /usr/local/lib/libdecor-0.so /usr/local/lib/libdecor.so fixed this running FreeBSD-13.1-p5