Complex dealii configuration doesn't concretize #7339
Description
Looks like there is a regression in concretizer. I have not seen this before.
Given the error below, I don't even know where to dig.
Expected Result
$ spack spec -I dealii@develop+mpi+petsc~int64 ^petsc+complex shoud concretize
Actual Result
$ spack spec -I dealii@develop+mpi+petsc~int64 ^petsc+complex
Input spec
--------------------------------
dealii@develop~int64+mpi+petsc
^petsc+complex
Concretized
--------------------------------
==> Error: Multiple providers found for 'pkgconfig': ['pkg-config', '[email protected]%[email protected] arch=darwin-highsierra-x86_64']
EDIT:
Information on your system
packages.yaml:
dealii:
version: [develop]
variants: +doc