我正在尝试安装cmake和rugged宝石。我的Ruby是193，我的DevKit与此版本相对应。我修改了系统PATH并安装了DevKit。
现在我尝试运行gem install cmake，我收到错误：
> gem install cmake
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing cmake:
ERROR: Failed to build gem native extension.
C:/Ruby193/bin/ruby.exe extconf.rb
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers. Check the mkmf.log file for more
details. You may need configuration options.
Provided configuration 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
--without-make-prog
--srcdir=.
--curdir
--ruby=C:/Ruby193/bin/ruby
extconf.rb:5:in `chdir': No such file or directory - C:/Ruby193/lib/ruby/gems/1.9.1/gems/
OENT)
from extconf.rb:5:in `<main>'
Gem files will remain installed in C:/Ruby193/lib/ruby/gems/1.9.1/gems/cmake-2.8.7 for in
Results logged to C:/Ruby193/lib/ruby/gems/1.9.1/gems/cmake-2.8.7/ext/cmake/gem_make.out
我不知道该怎么做，我之前使用过较新的Ruby，问题也是如此。我该怎么办？