当我尝试安装 bcrypt-ruby gem 时，出现以下错误
我在 Windows 7 32 上有 Cygwin
$ gem install bcrypt-ruby
Building native extensions. This could take a while...
ERROR: Error installing bcrypt-ruby:
ERROR: Failed to build gem native extension.
/home/Bartek/.rvm/rubies/ruby-1.9.3-p194/bin/ruby.exe extconf.rb
creating Makefile
make
compiling bcrypt_ext.c
compiling crypt.c
compiling crypt_blowfish.c
compiling crypt_gensalt.c
compiling wrapper.c
In file included from wrapper.c:27:0:
/home/Bartek/.rvm/rubies/ruby-1.9.3-p194/include/ruby-1.9.1/ruby/backward/util.h:2:2: warnin g: #warning use "ruby/util.h" instead of bare "util.h"
linking shared-object bcrypt_ext.so
bcrypt_ext.o:bcrypt_ext.c:(.text+0x29): undefined reference to `_ruby_bcrypt'
collect2: ld returned 1 exit status
Makefile:207: recipe for target `bcrypt_ext.so' failed
make: *** [bcrypt_ext.so] Error 1
Gem files will remain installed in /home/Bartek/.rvm/gems/ruby-1.9.3- p194@ckdatabase/gems/bc rypt-ruby-3.0.1 for inspection.
Results logged to /home/Bartek/.rvm/gems/ruby-1.9.3-p194@ckdatabase/gems/bcrypt-ruby- 3.0.1/e xt/mri/gem_make.out
有人知道该怎么做吗？ 我什么都试过了。