我在 Windows 上安装 Ruby-Debug Gem 时遇到问题。这个错误是什么意思？我怎样才能解决这个问题？谢谢
C:\Users\Steve>gem install ruby-debug
Building native extensions. This could take a while...
ERROR: Error installing ruby-debug:
ERROR: Failed to build gem native extension.
C:/Ruby19/bin/ruby.exe extconf.rb
Can't handle 1.9.x yet
*** 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:/Ruby19/bin/ruby
Gem files will remain installed in C:/Ruby19/lib/ruby/gems/1.9.1/gems/linecache-
0.43 for inspection.
Results logged to C:/Ruby19/lib/ruby/gems/1.9.1/gems/linecache-0.43/ext/gem_make
.out
我有以下宝石：
actionpack (2.3.5, 2.3.3)
activerecord (2.3.5, 2.3.3)
activeresource (2.3.5, 2.3.3)
activesupport (2.3.5, 2.3.3)
columnize (0.3.1)
json_pure (1.2.0)
rack (1.0.1)
rails (2.3.5, 2.3.3)
rake (0.8.7)
rmagick (1.14.1)
rubyforge (2.0.3)
rubygems-update (1.3.5)
sqlite3-ruby (1.2.5)
with rails version 3.3.5