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environment.yml

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+# Firedrake + icepack conda environment
+#
+# This provides all the compiled/native dependencies (PETSc, MPI, compilers,
+# etc.) from conda-forge so that no system packages are needed beyond conda
+# itself. Firedrake's own Python packages are then pip-installed on top.
+#
+# Usage:
+#   conda env create -f environment.yml
+#   conda activate firedrake
+#   bash setup.sh
+#
+# Tested on: Linux x86_64, macOS ARM64 (Apple Silicon)
+
+name: firedrake
+channels:
+  - conda-forge
+  - nodefaults
+
+dependencies:
+  # ── Python ──
+  - python >=3.11,<3.13
+
+  # ── Compilers (needed at runtime for Firedrake JIT) ──
+  # The `compilers` metapackage provides gcc/gfortran on Linux and
+  # clang/gfortran on macOS, all targeting the conda env's sysroot.
+  - compilers
+  - cmake
+  - make
+
+  # ── MPI ──
+  # mpich is more portable across platforms in conda-forge than openmpi.
+  # All MPI-linked packages below will be built against this same mpich.
+  - mpich
+
+  # ── PETSc ecosystem ──
+  # conda-forge PETSc includes: MUMPS, hypre, SuperLU, SuperLU_dist,
+  # METIS, ParMETIS, ScaLAPACK, SuiteSparse, pt-scotch.
+  - petsc =*=real*
+  - petsc4py
+  - slepc
+  - slepc4py
+
+  # ── HDF5 with MPI support ──
+  - hdf5 =*=mpi_mpich_*
+  - h5py =*=mpi_mpich_*
+
+  # ── Linear algebra ──
+  - libopenblas
+  - libblas =*=*openblas*
+  - liblapack =*=*openblas*
+  - scalapack
+
+  # ── Other compiled libs Firedrake needs ──
+  - patchelf  # [linux]
+  - libspatialindex
+  - gmsh
+
+  # ── Core Python dependencies ──
+  - numpy
+  - scipy
+  - cython
+  - mpi4py
+  - sympy
+  - cachetools
+  - packaging
+  - decorator
+  - requests
+  - setuptools
+  - pip
+  - wheel
+  - meson
+  - meson-python
+  - pkgconfig
+  - scikit-build-core
+  - ninja
+  - pybind11
+  - hatchling
+  - flit-core
+
+  # ── islpy / loopy code generation stack ──
+  - islpy
+
+  # ── Visualization (optional but useful) ──
+  - matplotlib
+
+  # ── Pip-installed packages ──
+  # These are the Firedrake-specific packages that are NOT on conda-forge.
+  # They're installed in the setup script, listed here for documentation.
+  # - pip:
+  #   - fenics-ufl (from git, Firedrake-compatible version)
+  #   - firedrake-fiat (Firedrake's FIAT fork)
+  #   - FInAT
+  #   - loopy (latest, for code generation)
+  #   - tsfc
+  #   - pyop2
+  #   - libsupermesh
+  #   - firedrake
+  #   - icepack