You are now in the directory for the port "net/ns" (package name "ns-2.1b5").
This is the one-line description for this port:
The UCB/LBNL Network Simulator Version 2
Please read the file "pkg/DESCR" for a longer description.
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This port requires package(s) "XFree86-3.3.5 otcl-1.0a4 tcl-8.2.2 tclcl-1.0b8 tk-8.2.2" to build.
This port requires package(s) "tcl-8.2.2" to run.