Hi Will, The error you got was from the PETSc installer, so you need to pass those options to PETSc, not directly to firedrake-install. export PETSC_CONFIGURE_OPTIONS="--download-fblaslapack=1" python firedrake-install --no-package-manager --disable-ssh Also note that you probably don't want --honour-pythonpath set. Unless you have a very special reason why the firedrake virtualenv needs to see external python packages, it is much safer to unset PYTHONPATH. Regards, David On Wed, 15 Mar 2017 at 11:12 William Booker <scwb@leeds.ac.uk> wrote: Dear Firedrakers, Running the install script $ python firedrake-install --no-package-manager --disable-ssh --honour-pythonpath gave me the following error: Could not find a functional BLAS. Run with --with-blas-lib=<lib> to indicate the library containing BLAS. Or --download-fblaslapack=1 to have one automatically downloaded and installed But the download option does not seem to be a recognised command for the install script $ python firedrake-install --no-package-manager --disable-ssh --honour-pythonpath --download-fblaslapack=1 firedrake-install: error: unrecognized arguments: --download-fblaslapack=1 Thanks Will -- Dr David Ham Department of Mathematics Imperial College London