Hi everyone, I installed firedrake onto our local KNL box which runs on CentOS 7.4, so I managed to install all the necessary requirements using --no-package-manager. The installation returns no error but I am seeing this error: (firedrake) [root@caamhpc ~]# python -c "from firedrake import *" Traceback (most recent call last): File "<string>", line 1, in <module> File "/root/Software/firedrake/src/firedrake/firedrake/__init__.py", line 29, in <module> from pyop2 import op2 # noqa File "/root/Software/firedrake/src/PyOP2/pyop2/__init__.py", line 4, in <module> from pyop2.op2 import * # noqa File "/root/Software/firedrake/src/PyOP2/pyop2/op2.py", line 42, in <module> from pyop2.base import i # noqa: F401 File "/root/Software/firedrake/src/PyOP2/pyop2/base.py", line 57, in <module> from pyop2.sparsity import build_sparsity ImportError: /root/Software/firedrake/src/PyOP2/pyop2/ sparsity.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _intel_fast_memset I have never seen this before. Here's some information that may be helpful: (firedrake) [root@caamhpc ~]# ldd /root/Software/firedrake/src/PyOP2/pyop2/ sparsity.cpython-36m-x86_64-linux-gnu.so linux-vdso.so.1 => (0x00007fffc8f54000) libpetsc.so.3.07 => /root/Software/firedrake/lib/python3.6/site-packages/petsc/lib/libpetsc.so.3.07 (0x00007fbf5e1f0000) libpython3.6m.so.1.0 => /usr/local/lib/libpython3.6m.so.1.0 (0x00007fbf5dcb9000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007fbf5da86000) libc.so.6 => /lib64/libc.so.6 (0x00007fbf5d6c2000) liblapack.so.3 => /lib64/liblapack.so.3 (0x00007fbf5cf64000) libblas.so.3 => /lib64/libblas.so.3 (0x00007fbf5cd0b000) libparmetis.so => /root/Software/firedrake/lib/python3.6/site-packages/petsc/lib/libparmetis.so (0x00007fbf5cacf000) libmetis.so => /root/Software/firedrake/lib/python3.6/site-packages/petsc/lib/libmetis.so (0x00007fbf5c858000) libhdf5hl_fortran.so.10 => /root/Software/firedrake/lib/python3.6/site-packages/petsc/lib/libhdf5hl_fortran.so.10 (0x00007fbf5c645000) libhdf5_fortran.so.10 => /root/Software/firedrake/lib/python3.6/site-packages/petsc/lib/libhdf5_fortran.so.10 (0x00007fbf5c409000) libhdf5_hl.so.10 => /root/Software/firedrake/lib/python3.6/site-packages/petsc/lib/libhdf5_hl.so.10 (0x00007fbf5c1e7000) libhdf5.so.10 => /root/Software/firedrake/lib/python3.6/site-packages/petsc/lib/libhdf5.so.10 (0x00007fbf5bd08000) libm.so.6 => /lib64/libm.so.6 (0x00007fbf5ba06000) libgfortran.so.3 => /lib64/libgfortran.so.3 (0x00007fbf5b6e3000) libquadmath.so.0 => /lib64/libquadmath.so.0 (0x00007fbf5b4a7000) libmpicxx.so.12 => /opt/intel/compilers_and_libraries_2016.3.210/linux/mpi/intel64/lib/libmpicxx.so.12 (0x00007fbf5b287000) libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007fbf5af7e000) libdl.so.2 => /lib64/libdl.so.2 (0x00007fbf5ad7a000) libmpifort.so.12 => /opt/intel/compilers_and_libraries_2016.3.210/linux/mpi/intel64/lib/libmpifort.so.12 (0x00007fbf5a9dc000) libmpi.so.12 => /opt/intel/compilers_and_libraries_2016.3.210/linux/mpi/intel64/lib/libmpi.so.12 (0x00007fbf5a20c000) librt.so.1 => /lib64/librt.so.1 (0x00007fbf5a004000) libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007fbf59dee000) libutil.so.1 => /lib64/libutil.so.1 (0x00007fbf59bea000) /lib64/ld-linux-x86-64.so.2 (0x00007fbf5f8b9000) (firedrake) [root@caamhpc ~]# which mpicc /opt/intel/compilers_and_libraries_2016.3.210/linux/mpi/intel64/bin/mpicc (firedrake) [root@caamhpc ~]# mpicc --version gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-16) Copyright (C) 2015 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This system wants to use intel compilers but I told it to use GNU compilers. I suspect this error has something to do with intel. I can try and provide more information as necessary. Thanks, Justin