
* Make mpi, scipy, petsc4py, and nlopt support optional * Later versions depend on python@3.5: * Versions before 0.4.1 must build with MPI: add a conflict for @:0.4.1~mpi
* Make mpi, scipy, petsc4py, and nlopt support optional * Later versions depend on python@3.5: * Versions before 0.4.1 must build with MPI: add a conflict for @:0.4.1~mpi