Clang-21 and Clang-22 fail for mixed Fortran and C builds

ubuntu-gcc12 update gcc?

'rchk' container breaks on recent R-devel: "Error in vapply : ... values must be length 1"

donttest container doesn't run donttest examples

clang20 container missing libc++

Dependencies step failing in Clang containers

Install basic Unix tools like `sed`, `awk`, etc.

LTO option failing to configure?

RHEL9: Your system is mis-configured: ‘/var/db/timezone/localtime’ is not a symlink

libomp.so.5: cannot open shared object file: No such file or directory