I get *** Building petsc4py *** running build running build_src removing Cython 0.29.30 from sys.modules fetching build requirement 'Cython >= 0.29.32' Searching for Cython>=0.29.32 Best match: Cython 3.0.0b2 Processing Cython-3.0.0b2-py3.8-macosx-10.9-x86_64.egg
Using /PETSc3/petsc/petsc-dev/src/binding/petsc4py/.eggs/Cython-3.0.0b2-py3.8-macosx-10.9-x86_64.egg using Cython 3.0.0b2 cythonizing 'petsc4py/PETSc.pyx' -> 'petsc4py/PETSc.c' /PETSc3/petsc/petsc-dev/src/binding/petsc4py/conf/cythonize.py: No such file or directory: 'petsc4py/PETSc.pyx' error: Cython failure: 'petsc4py/PETSc.pyx' -> 'petsc4py/PETSc.c' **************************ERROR************************************* Error building petsc4py. Thanks, Matt -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener https://www.cse.buffalo.edu/~knepley/ <http://www.cse.buffalo.edu/~knepley/>