Howto build on OS X

1. python3-config --configdir to get the correct Python library directory
2. ./configure --disable-gui --disable-nls --enable-cscope \ --with-modified-by=madhatter --disable-gpm --enable-multibyte \ --prefix=/usr/local --with-features=normal --enable-rubyinterp \ --enable-python3interp --with-python3-command=python3.9 \ --with-python3-config-dir=/opt/homebrew/opt/python@3.9/Frameworks/Python.framework/Versions/3.9/lib/python3.9/config-3.9-darwin
3. make
4. sudo make install