You are now in the directory for the port "cad/pcb" (package name "pcb-1.4.0").
This is the one-line description for this port:
X11 interactive printed circuit board layout system
Please read the file "pkg/DESCR" for a longer description.
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This port requires package(s) "bison-1.25 flex-2.5.3 m4-1.4" to build.