You are now in the directory for the port "x11/blt" (package name "blt-2.1").
This is the one-line description for this port:
A Tk extension (with shared libs)
Please read the file "pkg/DESCR" for a longer description.
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This port requires package(s) "tk-4.1" to build.
This port requires package(s) "tk-4.1" to run.