Hello PETSc Support Team,
I hope this email finds you well. I need help configuring PETSc on my Mac running MacOS Ventura 13.6 with Xcode 15. I have recently updated my operating system and Xcode and am facing issues setting up PETSc with gfortran-13. Thank you for your assistance. System Information - MacOS Version: Ventura 13.6 - Xcode Version: 15 - gfortran Version: 13 (installed via Homebrew) - PETSc Version: [Your PETSc Version] Steps to Reproduce I followed the standard installation steps as outlined in the PETSc documentation. Below is the relevant section of the Bash script I used for configuration: #!/bin/bash # PETSc environment variables export PETSC_DIR=/path/to/petsc export PETSC_ARCH=arch-cmplx-opt # Configuration cd $PETSC_DIR ./configure --with-cc=gcc-13 --with-cxx=g++-13 --with-fc=gfortran-13 --with-f90=gfortran-13 \ --with-debugging=no --with-scalar-type=complex --with-openmp \ --download-mpich --download-fblaslapack --download-scalapack \ --download-mumps --download-metis --download-parmetis --download-hwloc \ COPTFLAGS="-O3" CXXOPTFLAGS="-O3" FOPTFLAGS="-Ofast" $PETSC_ARCH Error Message The configure script throws the following error: UNABLE to CONFIGURE with GIVEN OPTIONS (see configure.log for details): Fortran compiler you provided with --with-fc=gfortran-13 cannot be found or does not work. Cannot compile/link FC with gfortran-13. To verify if gfortran-13 is working, I tested it by compiling a simple Fortran program, and it worked despite a linker warning related to duplicate libraries. Additional Information I also ran brew doctor to ensure my Homebrew setup was fine and no issues were found. Can you guide me on how to resolve this issue? I can also provide the configure.log file if that would be helpful for debugging. Thank you for your time and assistance. Best regards, Felipe.