Things to consider:

o You'll want to make sure the first line of the rfc script points
  to your perl binary.

o Take a look at the first 20-30 lines and see if there are any 
  environment or configuration changes you want to make.  ie, if
  you don't have root on the box you'll want to change $indexpath
  to something you can write to.

o run the install.sh script which copies the script to 
  /usr/local/bin/ and puts the man page in /usr/local/man/man1

  $ sudo sh ./install.sh
  Copying ./rfc-3.2.2 to /usr/local/bin//rfc
  Copying the man page to /usr/local/man/man1/
  Done

  Run the command  "rfc -i" as root to download the rfc-index


o If you didn't change the $indexpath, run the  rfc -i command
  as root to download the latest rfc-index to /usr/local/etc/

o search for something you're curious about:
  rfc -k kerberos     



Send me feedback if you find this useful, I'd love to hear about it :D
rfc@blinky-lights.org or rfc@dewn.com