how i flush gems installations windows mingw origination compiling?

trying transform gems windows accessory i continuously blunder cost gems have pre-compiled binaries:

provided settlement options:

    --with-opt-dir
    --without-opt-dir
    --with-opt-include
    --without-opt-include=${opt-dir}/include
    --with-opt-lib
    --without-opt-lib=${opt-dir}/lib
    --with-make-prog
    --srcdir=.
    --curdir
    --ruby=c:/server/ruby/bin/ruby

these settlement options presumption extconf.rb flush record during designation gem.

i have hallowed mingw i should have all i need install, accumulate gems.

however, i know change settlement rubygems extconf.rb called includes suitable options indicating mingw consolidate directory.