On Thu, 5 Mar 2020, Mark Adams wrote: > I updated to OS X Catalina and I get this error. I opened Xcode and in > updated some stuff and I reinstalled mpich with homebrew. Any ideas? Its best to reinstall all homebrew packages. https://lists.mcs.anl.gov/mailman/htdig/petsc-users/2016-January/028105.html Satish > Thanks, > Mark >