cpan> install GraphViz
..
Can't exec "gpg": No such file or directory at ..
..
Cannot use GnuPG or Crypt::OpenPGP, please install either one first!
..
  CPAN.pm: Going to build L/LB/LBROCARD/GraphViz-2.02.tar.gz

Looking for dot... found it at /usr/local/bin/dot
Checking if your kit is complete...
Looks good
Warning: prerequisite IPC::Run 0.6 not found.
..
---- Unsatisfied dependencies detected during [L/LB/LBROCARD/GraphViz-2.02.tar.gz] -----
    IPC::Run
Shall I follow them and prepend them to the queue
of modules we are processing right now? [yes] yes
..