Version 20230428 is available upstream. Please consider updating!
It seems that version 20230428 is available upstream, while the latest version in the Gentoo tree is 20100827. You think this warning is false? Read more about it here.
F2C compiles FORTRAN 77 sources by converting to C/C++ sources and
compiling the later with gcc. The resulting binaries depend on the
libf2c runtime library.