mkmf doesn't work with miniruby on Windows
nmake failes to run when making ripper and so on.
It because miniruby sets UTF-8 encoding even though the content is CP932 (on Japanese Windows).
It should set ASCII-8BIT and handle as it is.
ripper: " Could not be configured. It will not be installed." " C:/ruby-trunk/lib/mkmf.rb:1560: invalid byte sequence in UTF-8" " Check ext/ripper/mkmf.log for more details." *** Fix the problems, then remove these directories and try again if you want.
Note that recent Windows sets PATH to paths under %APPDATA% for example