The attached patch makes sure that os.path.join(sys.prefix, 'lib') isn't added to the link path when using a framework build.

This fixes the issue at hand in that I can then build a 3-way build of 2.7 when the default 32-bit is already installed. Without the patch _curses_panel fails to build because it tries to link to a 32-bit only library.

What I haven't done yet is check how this affects the script that builds the installer. That's the primary reason for not applying the patch at this time