I was going to try an install from source until I found directions for just rebuilding the native code launcher and SWT .so libraries for the PowerPC architecture, starting with a x86 Linux GTK distribution.
In order to get the build to work, I had to make 2 small changes:
1. ln -s /usr/X11R6/lib/libXtst.so.6 /usr/X11R6/lib/libXtst.so
2. Compilation error: missing XTest.h, so I just commented out that include file