hbuesing@cluster-x2:~/Code/firedrake$ firedrake-clean
/home/hbuesing/.local/lib/python2.7/site-packages/petsc4py/lib/__init__.py:121: UserWarning: ignored arch: 'arch-linux2-c', using: 'arch-linux2-c-opt'
  (os.path.pathsep.join(arch_env), arch))
Traceback (most recent call last):
  File "/home/hbuesing/.local/bin/firedrake-clean", line 3, in <module>
    from firedrake.ffc_interface import clear_cache, FFCKernel
  File "/rwthfs/rz/cluster/home/hbuesing/Code/firedrake/firedrake/__init__.py", line 3, in <module>
    import firedrake.petsc as petsc
  File "/rwthfs/rz/cluster/home/hbuesing/Code/firedrake/firedrake/petsc.py", line 5, in <module>
    petsc4py.init(sys.argv)
  File "/home/hbuesing/.local/lib/python2.7/site-packages/petsc4py/__init__.py", line 42, in init
    PETSc = petsc4py.lib.ImportPETSc(arch)
  File "/home/hbuesing/.local/lib/python2.7/site-packages/petsc4py/lib/__init__.py", line 29, in ImportPETSc
    return Import('petsc4py', 'PETSc', path, arch)
  File "/home/hbuesing/.local/lib/python2.7/site-packages/petsc4py/lib/__init__.py", line 64, in Import
    module = imp.load_module(fullname, fo, fn, stuff)
ImportError: /home/hbuesing/.local/lib/python2.7/site-packages/petsc4py/lib/arch-linux2-c-opt/PETSc.so: undefined symbol: SNESSetConvergedReason
hbuesing@cluster-x2:~/Code/firedrake$