You are now in the directory for the port "graphics/pnmtopng" (package name "pnmtopng-2.37.3").
This is the one-line description for this port:
Converter between PNG and portable anymap images
Please read the file "pkg/DESCR" for a longer description.
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This port requires package(s) "XFree86-3.3.5 jpeg-6b netpbm-8.0 png-1.0.5 tiff-3.5.4" to build.
This port requires package(s) "XFree86-3.3.5 png-1.0.5" to run.