modify cmake Modules for MacPorts prefix

[dweber@…]

I'm working on an InsightToolkit port that will install into a non-standard MacPorts install path. I've discovered that the defaults in the cmake Modules may not pick up the MacPort installations. For example, in /opt/local/share/cmake-2.6/Modules/FindITK.cmake, we could modify it to the following:

    # Look in standard UNIX install locations.
        /opt/local/lib/InsightToolkit
        /opt/local/lib/InsightToolkit-3.12
    /usr/local/lib/InsightToolkit
    /usr/lib/InsightToolkit

I was able to get this result with a command line like this:

cat /opt/local/share/cmake-2.6/Modules/FindITK.cmake | sed -e 's|/usr/local/lib/InsightToolkit|/opt/local/lib/InsightToolkit\n\t/opt/local/lib/InsightToolkit-3.12\n\t/usr/local/lib/InsightToolkit|g'

I suppose other tweaks like this could be a part of the post-destroot for the cmake port. The goal is to allow any MacPort installation to rely on cmake modules to pick up other MacPort libraries automatically, and in preference (with precedence) to anything similar installed outside of ${prefix} on the system.

Best regards, Darren