- Oops, I had the post/preun scripts attached to the -libs packages, while
  the mpivars.* files mpi-selector needed was installed in the base
  package.  This presented a race condition where the mpivars.* files might
  or might not be present by the time the post script ran.  We attach to the
  right package now.
- Resolves: bz440397
- Related: bz428199