title: Ruby: problem installing EventMachine under Windows 7
body: <p>I am trying to install the gem EventMachine on Windows 7 (using Ruby 1.9.2 with RubyInstaller) via bundle, but I get the following error. I also installed DevKit and it is working, but I still can't figure out what the problem is:</p>
  
  <pre><code>Installing eventmachine (0.12.10) with native extensions C:/Ruby192/lib/ruby/site_ruby/1.9
  .1/rubygems/installer.rb:551:in `rescue in block in build_extensions': ERROR: Failed to bu
  ild gem native extension. (Gem::Installer::ExtensionBuildError)
  
          C:/Ruby192/bin/ruby.exe extconf.rb
  checking for rb_trap_immediate in ruby.h,rubysig.h... no
  checking for rb_thread_blocking_region()... yes
  checking for inotify_init() in sys/inotify.h... no
  checking for __NR_inotify_init in sys/syscall.h... no
  checking for writev() in sys/uio.h... no
  checking for rb_thread_check_ints()... yes
  checking for rb_time_new()... yes
  checking for windows.h... yes
  checking for winsock.h... yes
  checking for main() in -lkernel32... yes
  checking for main() in -lrpcrt4... yes
  checking for main() in -lgdi32... yes
  checking for main() in -lssl... no
  creating Makefile
  
  make
  C:/Ruby192/bin/ruby -e "puts 'EXPORTS', 'Init_rubyeventmachine'"  &gt; rubyeventmachine-i386-
  mingw32.def
  g++ -I. -IC:/Ruby192/include/ruby-1.9.1/i386-mingw32 -I/C/Ruby192/include/ruby-1.9.1/ruby/
  backward -I/C/Ruby192/include/ruby-1.9.1 -I. -DBUILD_FOR_RUBY -DHAVE_RB_THREAD_BLOCKING_RE
  GION -DHAVE_TBR -DHAVE_RB_THREAD_CHECK_INTS -DHAVE_RB_TIME_NEW -DOS_WIN32 -DHAVE_WINDOWS_H
   -DHAVE_WINSOCK_H -DWITHOUT_SSL -DHAVE_MAKE_PAIR    -O3 -g -Wextra -Wno-unused-parameter -
  Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-
  long   -o binder.o -c binder.cpp
  In file included from project.h:137:0,
                   from binder.cpp:20:
  binder.h:35:34: warning: type qualifiers ignored on function return type
  In file included from project.h:138:0,
                   from binder.cpp:20:
  em.h:91:47: warning: type qualifiers ignored on function return type
  em.h:92:76: warning: type qualifiers ignored on function return type
  em.h:93:56: warning: type qualifiers ignored on function return type
  em.h:95:57: warning: type qualifiers ignored on function return type
  em.h:96:60: warning: type qualifiers ignored on function return type
  em.h:97:58: warning: type qualifiers ignored on function return type
  em.h:98:55: warning: type qualifiers ignored on function return type
  em.h:99:36: warning: type qualifiers ignored on function return type
  em.h:101:47: warning: type qualifiers ignored on function return type
  em.h:106:42: warning: type qualifiers ignored on function return type
  em.h:123:45: warning: type qualifiers ignored on function return type
  em.h:132:36: warning: type qualifiers ignored on function return type
  In file included from project.h:145:0,
                   from binder.cpp:20:
  eventmachine.h:45:61: warning: type qualifiers ignored on function return type
  eventmachine.h:46:112: warning: type qualifiers ignored on function return type
  eventmachine.h:47:69: warning: type qualifiers ignored on function return type
  eventmachine.h:49:73: warning: type qualifiers ignored on function return type
  eventmachine.h:62:75: warning: type qualifiers ignored on function return type
  eventmachine.h:63:74: warning: type qualifiers ignored on function return type
  eventmachine.h:64:77: warning: type qualifiers ignored on function return type
  eventmachine.h:65:41: warning: type qualifiers ignored on function return type
  In file included from project.h:145:0,
                   from binder.cpp:20:
  eventmachine.h:99:60: warning: type qualifiers ignored on function return type
  eventmachine.h:100:58: warning: type qualifiers ignored on function return type
  eventmachine.h:102:60: warning: type qualifiers ignored on function return type
  eventmachine.h:105:41: warning: type qualifiers ignored on function return type
  g++ -I. -IC:/Ruby192/include/ruby-1.9.1/i386-mingw32 -I/C/Ruby192/include/ruby-1.9.1/ruby/
  backward -I/C/Ruby192/include/ruby-1.9.1 -I. -DBUILD_FOR_RUBY -DHAVE_RB_THREAD_BLOCKING_RE
  GION -DHAVE_TBR -DHAVE_RB_THREAD_CHECK_INTS -DHAVE_RB_TIME_NEW -DOS_WIN32 -DHAVE_WINDOWS_H
   -DHAVE_WINSOCK_H -DWITHOUT_SSL -DHAVE_MAKE_PAIR    -O3 -g -Wextra -Wno-unused-parameter -
  Wno-parentheses -Wpointer-arith -Wwrite-strings -Wno-missing-field-initializers -Wno-long-
  long   -o cmain.o -c cmain.cpp
  In file included from project.h:137:0,
                   from cmain.cpp:20:
  binder.h:35:34: warning: type qualifiers ignored on function return type
  In file included from project.h:138:0,
                   from cmain.cpp:20:
  em.h:91:47: warning: type qualifiers ignored on function return type
  em.h:92:76: warning: type qualifiers ignored on function return type
  em.h:93:56: warning: type qualifiers ignored on function return type
  em.h:95:57: warning: type qualifiers ignored on function return type
  em.h:96:60: warning: type qualifiers ignored on function return type
  em.h:97:58: warning: type qualifiers ignored on function return type
  em.h:98:55: warning: type qualifiers ignored on function return type
  em.h:99:36: warning: type qualifiers ignored on function return type
  em.h:101:47: warning: type qualifiers ignored on function return type
  em.h:106:42: warning: type qualifiers ignored on function return type
  em.h:123:45: warning: type qualifiers ignored on function return type
  em.h:132:36: warning: type qualifiers ignored on function return type
  In file included from project.h:145:0,
                   from cmain.cpp:20:
  eventmachine.h:45:61: warning: type qualifiers ignored on function return type
  eventmachine.h:46:112: warning: type qualifiers ignored on function return type
  eventmachine.h:47:69: warning: type qualifiers ignored on function return type
  eventmachine.h:49:73: warning: type qualifiers ignored on function return type
  eventmachine.h:62:75: warning: type qualifiers ignored on function return type
  eventmachine.h:63:74: warning: type qualifiers ignored on function return type
  eventmachine.h:64:77: warning: type qualifiers ignored on function return type
  eventmachine.h:65:41: warning: type qualifiers ignored on function return type
  In file included from project.h:145:0,
                   from cmain.cpp:20:
  eventmachine.h:99:60: warning: type qualifiers ignored on function return type
  eventmachine.h:100:58: warning: type qualifiers ignored on function return type
  eventmachine.h:102:60: warning: type qualifiers ignored on function return type
  eventmachine.h:105:41: warning: type qualifiers ignored on function return type
  cmain.cpp:98:71: warning: type qualifiers ignored on function return type
  cmain.cpp:109:122: warning: type qualifiers ignored on function return type
  cmain.cpp:119:79: warning: type qualifiers ignored on function return type
  cmain.cpp:129:83: warning: type qualifiers ignored on function return type
  cmain.cpp:260:85: warning: type qualifiers ignored on function return type
  cmain.cpp:270:84: warning: type qualifiers ignored on function return type
  cmain.cpp:280:88: warning: type qualifiers ignored on function return type
  cmain.cpp:290:51: warning: type qualifiers ignored on function return type
  cmain.cpp:300:70: warning: type qualifiers ignored on function return type
  cmain.cpp:320:55: warning: type qualifiers ignored on function return type
  cmain.cpp:546:70: warning: type qualifiers ignored on function return type
  cmain.cpp:669:68: warning: type qualifiers ignored on function return type
  cmain.cpp: In function 'int evma_send_file_data_to_connection(long unsigned int, const cha
  r*)':
  cmain.cpp:752:6: error: cannot convert 'stat*' to '_stati64*' for argument '2' to 'int _fs
  tati64(int, _stati64*)'
  make: *** [cmain.o] Error 1
  
  
  Gem files will remain installed in C:/Ruby192/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.1
  0 for inspection.
  Results logged to C:/Ruby192/lib/ruby/gems/1.9.1/gems/eventmachine-0.12.10/ext/gem_make.ou
  t
          from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:529:in `block in bu
  ild_extensions'
          from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:504:in `each'
          from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:504:in `build_exten
  sions'
          from C:/Ruby192/lib/ruby/site_ruby/1.9.1/rubygems/installer.rb:180:in `install'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/source.rb:101:
  in `block in install'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/rubygems_integ
  ration.rb:78:in `preserve_paths'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/source.rb:91:i
  n `install'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:5
  8:in `block (2 levels) in run'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/rubygems_integ
  ration.rb:93:in `with_build_args'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:5
  7:in `block in run'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12
  :in `block in each'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12
  :in `each'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/spec_set.rb:12
  :in `each'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:4
  9:in `run'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/installer.rb:8
  :in `install'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/cli.rb:222:in
  `install'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor/ta
  sk.rb:22:in `run'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor/in
  vocation.rb:118:in `invoke_task'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor.rb
  :246:in `dispatch'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/lib/bundler/vendor/thor/ba
  se.rb:389:in `start'
          from C:/Ruby192/lib/ruby/gems/1.9.1/gems/bundler-1.0.15/bin/bundle:13:in `&lt;top (re
  quired)&gt;'
          from C:/Ruby192/bin/bundle:19:in `load'
          from C:/Ruby192/bin/bundle:19:in `&lt;main&gt;'
  </code></pre>
  
  <p>Thanks a lot in advance!</p>