[Bug libfortran/117857] libgfortran on powerpc-darwin8 doesn't compile: `-Wint-conversion` in `stream_ttyname`

[glex.spb at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=117857

--- Comment #14 from Gleb Mazovetskiy <glex.spb at gmail dot com> ---
In macports, a lot of packages seem to simply pass `-D__DARWIN_UNIX03=1`:

https://github.com/search?q=repo%3Amacports%2Fmacports-ports+D__DARWIN_UNIX03&type=code