ruby_do_compile() {
        if [ -f extconf.rb -a ! -f extconf.rb.orig ] ; then
                grep create_makefile extconf.rb > append2 || (exit 0)
                ruby_gen_extconf_fix
                cp extconf.rb extconf.rb.orig
                # Patch extconf.rb for cross compile
                cat append >> extconf.rb
        fi
        for gem in ${RUBY_BUILD_GEMS}; do
                ${RUBY_COMPILE_FLAGS} gem build $gem
        done
        if [ -f extconf.rb.orig ] ; then
                mv extconf.rb.orig extconf.rb
        fi
}