SYNOPSIS

     % PERL5OPT=-MFile::Which::Patch::Hide=-prog,'foo;bar' app.pl

    This module can be used to simulate the absence of certain programs.
    This module works by patching (wrapping) File::Which's which() routine
    to remove the result if the programs that want to be hidden are listed
    in the result. So only programs that use which() will be fooled.

    An example of how I use this module: Nodejs::Util has a routine
    get_nodejs_path() which uses File::Which::which() to check for the
    existence of node.js binary. The get_nodejs_path() routine is used in
    some of my test scripts to optionally run tests when node.js is
    available. So to simulate a condition where node.js is not available:

     % PERL5OPT=-MFile::Which::Patch::Hide=-prog,'node;nodejs' prove ...