libunp is the library used in W. Richard Stevens' book "UNIX Network Programming Volume 1, 2nd Edition". It contains the library and headers used in the examples as well as all programs from the text that compile on FreeBSD systems. For more information on the book, see http://www.phptr.com/ptrbooks/ptr_013490012X.html For more info on W. Richard Stevens, see http://www.kohala.com/~rstevens/