Color highlighting for less fails

I saw that you use [source-highlight](http://www.gnu.org/software/src-highlite/) to [add color to less](https://github.com/fnichol/bashrc/blob/master/bashrc). I compiled the tool under MacOSX and added the exports. However, when I run e.g. `less ~/.zshrc` I receive the following error: `src-hilite-lesspipe.sh: line 9: source-highlight: command not found`
