Simply use the d/l code link at the bottom of the page and get the module. Then in your pircd directory, make a subdirectory named Portable, then rename the file you downloaded NonBlock.pm and put it in the Portable directory. Open it up and change setnonblock in the @EXPORT_OK declaration to setsocknonblock (Looks like a simple typo, correct me if I'm wrong). Then in the pircd file, put use Portable::NonBlock qw(setsocknonblock); at the top and replace all instances of setnonblocking to setsocknonblock (except for the sub declaration for setnonblocking. You can leave that as it is or take it out). Unfortunately, even though the IRCd will run now, you'll get an error after a user connects, which is "Your vendor has not defined POSIX macro EWOULDBLOCK".