Changing the Environment (such as PATH)

[Rob Emanuele]

Greetings,

I'm using Emacs for osx (the carbon version) and I need a way to alter
the path in which emacs searches for programs.  I need to alter this
path after emacs has started.  For example, I need to run a particular
version of arm-eabi-gdb or scons.  These executables are not in the
usual places as they are custom per project.  I would like to be able
to alter my path after emacs has started so that I can use 'M-x gdb'
and just type arm-eabi-gdb to invoke it.  Is this possible?

Thanks,

Rob