In CMakeLists.txt, when building with PETSc, call enable_language(C), which seems to be required by find_package(PETSc REQUIRED).
In CMakeLists.txt, when building with PETSc, call enable_language(C),
which seems to be required by find_package(PETSc REQUIRED).

mfem/mfem,kvoronin/mfem-4d-own,mfem/mfem,mfem/mfem,mfem/mfem,mfem/mfem