Hey All, I am trying to get Firedrake installed on a new Ubuntu 15.04 machine, and I am having some issues. I have attached the complete output from the install script, the relevant error line seems to be: configure: error: Can't find or link to the z library. Turn off netCDF-4 and opendap with --disable-netcdf-4 --disable-dap, or see config.log for errors. in the PETSc configuration, so I tried: export PETSC_CONFIGURE_OPTIONS="--download-ctetgen --download-triangle --download-chaco --download-metis --download-parmetis --download-scalapack --download-hypre --download-mumps --download-hdf5 --download-exodusii --disable-netcdf-4 --disable-dap" but that still gave the error (in fact, it seems that the install script was still trying to install netcdf-4). This is a totally clean machine, just wiped it and installed Ubuntu 15.04 so I'm not sure what is going on. Any ideas? Is there a hidden dependency for netcdf-4 or dap in the PETSc options I selected? Regards -Chris Eldred -- Chris Eldred Postdoctoral Fellow, LAGA, University of Paris 13 PhD, Atmospheric Science, Colorado State University, 2015 DOE Computational Science Graduate Fellow (Alumni) B.S. Applied Computational Physics, Carnegie Mellon University, 2009 chris.eldred@gmail.com