Dear all, I have a problem while updating the PETSC-dev. When I 'make' it, it says: libfast in: /work/zlwei/PETSc/petsc-dev/src/snes/f90-mod petscsnesmod.F:4.72: use petsckspdef 1 Fatal Error: Can't open module file 'petsckspdef.mod' for reading at (1): No such file or directory best, Alan