one of the most inane things I've seen in PETSc in a long time

[Barry Smith]

   In my arch-gnu/include/petscconf.h

#ifndef PETSC_ARCH_NAME
#define PETSC_ARCH_NAME "arch-gnu"
#endif

#ifndef PETSC_ARCH
#define PETSC_ARCH darwin9
#endif

   Meanwhile in all the makefiles PETSC_ARCH is arch-gnu

   I am endeavoring to fix this, but it might break something for a  
while.

   Barry