Description of problem: The pstack package is part of the FC1 i386 distribution. This package is missing from the FC1 x86_64 distribution.
pstack is exclusivearch ix86, and does not appear to be 64bit safe. * Tue May 28 2002 Jakub Jelinek <jakub> - build on x86 only
Closing ... I missed the part about x86 only when checking.