Redmine

My server is win2008 R2 x64.
And Install redmine follow with Installing Redmine on Windows Server 2008 R2 and Apache with Thin as a windows service and Installing Redmine,
Before is no problem,but in 'Step 5 - Session store secret generation',input 'rake generate_secret_token',it show:

E:\webserver\redmine>rake generate_secret_token
rake aborted!
cannot load such file -- eventmachine
E:/webserver/redmine/config/application.rb:7:in `<top (required)>'
E:/webserver/redmine/Rakefile:5:in `<top (required)>'
(See full trace by running task with --trace)

Then,I install eventmachine.Input'gem install eventmachine',it show:

E:\webserver\DevKit>gem install eventmachine
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing eventmachine:
        ERROR: Failed to build gem native extension.

    e:/webserver/Ruby/bin/ruby.exe extconf.rb
checking for main() in -lssl... no
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_wait_for_single_fd()... yes
checking for rb_enable_interrupt()... no
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
creating Makefile

make
generating rubyeventmachine-x64-mingw32.def
compiling binder.cpp
In file included from e:\webserver\devkit\mingw\bin\../lib/gcc/x86_64-w64-mingw3
2/4.7.2/../../../../x86_64-w64-mingw32/include/process.h:12:0,
                 from e:/webserver/Ruby/include/ruby-2.0.0/ruby/win32.h:60,
                 from e:/webserver/Ruby/include/ruby-2.0.0/ruby/defines.h:153,
                 from e:/webserver/Ruby/include/ruby-2.0.0/ruby/ruby.h:70,
                 from e:/webserver/Ruby/include/ruby-2.0.0/ruby.h:33,
                 from em.h:24,
                 from project.h:150,
                 from binder.cpp:20:
e:\webserver\devkit\mingw\bin\../lib/gcc/x86_64-w64-mingw32/4.7.2/../../../../x8
6_64-w64-mingw32/include/sys/types.h:68:16: error: conflicting declaration 'type
def _pid_t pid_t'
In file included from binder.cpp:20:0:
project.h:97:13: error: 'pid_t' has a previous declaration as 'typedef int pid_t
'
In file included from project.h:151:0,
                 from binder.cpp:20:
ed.h: In member function 'void EventableDescriptor::SetSocketInvalid()':
ed.h:43:40: warning: overflow in implicit constant conversion [-Woverflow]
make: *** [binder.o] Error 1

Gem files will remain installed in e:/webserver/Ruby/lib/ruby/gems/2.0.0/gems/ev
entmachine-1.0.3 for inspection.
Results logged to e:/webserver/Ruby/lib/ruby/gems/2.0.0/gems/eventmachine-1.0.3/
ext/gem_make.out

I also edit gemfile,to add 'gem "eventmachine", "~> 1.0.3"',and change 'Gemfile.local' both 'gem "eventmachine", "~> 1.0.3"' and 'gem "eventmachine", "~> 1.0.0.rc.4"',them all failed.

How can I do?