> An alternative solution could be to have the installation add a symlink from /bin/ex to /usr/bin/ex, this could save patching GDB which indeed looks to have until today /bin/ex hardcoded in the codebase.
> It looks to be a pretty standard path across unix likes.
> 
> I can work on a patch for the alternative solution if it sounds better

While that would be easy to do (LINKS in usr.bin/vi/build/Makefile and
simple adjustments in distrib/sets) it doesn't feel right for many
reasons: for example, /bin only contains statically linked binaries,
which ex isn't. After all, it's a quirk of gdb we're talking about...