pkg:setup
./autogen.sh unless build.stable?
pkg:configure --disable-dependency-tracking --with-libreadline-prefix=#{Formula[readline"].opt_prefix}" --with-libgmp-prefix=#{Formula[gmp"].opt_prefix}"
make DESTDIR=${PKG_DEST} install
Pathname.glob("#{lib}/*.dylib") do |dylib|
lib.install_symlink dylib.basename => "#{dylib.basename(".dylib")}.so"