Hey, Point Cloud Library, let's be friends

AKA installing PCL on a mac. Here's what I had to do/get/whatever:

Dependencies:

• cmake (from dmg)
• eigen 
• boost (wound up getting this from macports, too)
• flann (regular ann is already my best friend!)
• cminpack
• qhull (from macports)
• gcc 4.5 (from macports, website version is incomplete)

And this is how gcc gets update and actually used (thanks to help from one of the PCL mailing list members):
sudo port install gcc45
sudo port install gcc_select
Run gcc_select to identify versions available:  "gcc_select -l"
Select gcc45, in my case is was:  "sudo gcc_select mp-gcc45"

More helpful help: https://code.ros.org/lurker/message/20110401.025659.de4eecd0.en.html