You are now in the directory for the port "graphics/png" (package name "png-0.88").
This is the one-line description for this port:
libpng - manipulate PNG images library
Please read the file "pkg/DESCR" for a longer description.
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This port requires package(s) "libz-1.0.2" to build.
This port requires package(s) "libz-1.0.2" to run.