Dear PETSc developers, I got an error message when installing PETSc with a clang compiler. Could you please help me find the problem? The configure.log is attached. Best Regards, Yujie Here is the detail of the error: ============================================================================================= Configuring PETSc to compile on your system ============================================================================================= ============================================================================================= ***** WARNING: Using default optimization C flags -g -O3 You might consider manually setting optimal optimization flags for your system with COPTFLAGS="optimization flags" see config/examples/arch-*-opt.py for examples ============================================================================================= ============================================================================================= ***** WARNING: Using default Cxx optimization flags -g -O3 You might consider manually setting optimal optimization flags for your system with CXXOPTFLAGS="optimization flags" see config/examples/arch-*-opt.py for examples ============================================================================================= ============================================================================================= ***** WARNING: Using default FORTRAN optimization flags -O You might consider manually setting optimal optimization flags for your system with FOPTFLAGS="optimization flags" see config/examples/arch-*-opt.py for examples ============================================================================================= ============================================================================================= Trying to download https://download.open-mpi.org/release/open-mpi/v4.1/openmpi-4.1.0.tar.gz for ============================================================================================= ============================================================================================= Running configure on OPENMPI; this may take several minutes ============================================================================================= ============================================================================================= Running make on OPENMPI; this may take several minutes ============================================================================================= ******************************************************************************* UNABLE to CONFIGURE with GIVEN OPTIONS (see configure.log for details): ------------------------------------------------------------------------------- Error running make; make install on OPENMPI *******************************************************************************