NixOS/nixpkgs — pull request #366 by bjornfor (2013-03-09 20:53:16+00:00)
Title: graphviz: fix vimdot program

vimdot doesn't work at the moment because one of its dependencies,
'which', is missing; vimdot fails to find gvim or vim and aborts.
Instead of adding a dependency on 'which', replace it with the POSIX
command 'command -v'.