I did a custom install of GIMP 2.7.4 on my system recently. It was installed to:
Since it didn't start automatically, I added that line to my .bashrc file and then restarted my computer. Now I can go to the command line and simply enter gimp-2.7 and the program launches.
I then decided I wanted to add a program icon to my Unity bar. Simplest way I have found to pin programs is to launch them, and then click the Keep In Launcher option.
However, that's where I'm having problems. I can pin the program just fine. However, when I go to launch the program it flashes light/dark a couple of times, but never launches.
Is there some other file I need to add the path to for this to work other than /home/.bashrc?