[petsc-dev] Requiring $prefix/lib for --with-pkg-dir=

[Jed Brown]

As of this commit, --with-mpi-dir=/prefix requires that /prefix/lib
exists.  I use ccache so this doesn't exist, but some packages don't
have/need $prefix/lib anyway.  (I got a working build by creating an
empty lib directory.)

Can we get relax this check or at the very least give an error message
that explains why we're failing?


commit 4d3c5e81ae5a13470b170f68287cb1ab351ca05d
Author: Satish Balay <balay at mcs.anl.gov>
Date:   Wed Feb 25 22:13:09 2015 -0600

    configure: skip non-existant dirs in generateGuesses()
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