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Local AMR PETSc builds on macOS were failing in PETSc configure because the pixi OpenMPI toolchain was not coherent for mixed C/C++/Fortran checks. The local build path previously relied on --with-mpi-dir alone, which left PETSc to pick up a combination of conda compiler environment variables, OpenMPI wrapper defaults, Apple clang, and pixi gfortran settings. On Apple Silicon this surfaced as mpif90 wrapper failures, misleading standard-header and math-check failures, and mixed-link problems during PETSc configure. Add a macOS/OpenMPI-specific setup path that runs for local builds only. It selects an external gfortran (preferring Homebrew), derives SDKROOT and the macOS deployment target from that Fortran toolchain, clears conflicting pixi/conda compiler environment variables, and forces the OpenMPI wrappers onto /usr/bin/clang, /usr/bin/clang++, and the chosen gfortran with explicit OMPI_*FLAGS. Also pass mpicc/mpicxx/mpif90 explicitly to PETSc configure for local builds and reuse the same setup for PETSc build, test, and petsc4py installation so the wrapper/compiler selection stays consistent across the full local PETSc workflow.
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Summary
This PR makes the local macOS OpenMPI PETSc build setup use a coherent compiler/toolchain configuration.
Motivation
On macOS, local OpenMPI PETSc builds can mix pixi/conda compiler wrappers, Apple clang, Homebrew gfortran, and SDK/deployment-target settings. That can produce an inconsistent PETSc configure/build environment.
Changes
CLUSTER=local, Darwin, and OpenMPI.Scope
This path is local macOS/OpenMPI-specific. It should not affect Gadi/HPC builds, Linux local builds, or MPICH builds.
Local environment where this was needed