Bug#964150: petsc: autopkgtest regression: mpiexec was unable to launch the specified application

[Drew Parsons]

Source: petsc
Followup-For: Bug #964150

This is not a bug in PETSc, it is a fault of the make package which
introduced gmake but broke the path to it. make-dfsg is blocked by
dpkg.  All-round infrastructure screw-up.

Drew