Comment 3 for bug 96354

Issue has to do with fact that prc-tools are based off gcc-2.95 which apparently does not understand x86_64. See the following page for a good discussion of the issue as well as a solution to get 32bit version of packages working using chroot.

http://blog.gnu-designs.com/solution-to-prc-tools-on-amd64-and-other-64-bit-machines