mailcatcher install problem

Hi - I am trying to install mailcatcher on Win 7 ruby 2.0.0p451
(2014-02-24) [x64-mingw32]. I have installed DevKit and am getting the
following when I do a gem install mailcatcher:

C:\rails_projects\store4>gem install mailcatcher
Temporarily enhancing PATH to include DevKit...
Building native extensions. This could take a while...
ERROR: Error installing mailcatcher:
        ERROR: Failed to build gem native extension.

    C:/Ruby200-x64/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 "DESTDIR="
generating rubyeventmachine-x64-mingw32.def
compiling binder.cpp
In file included from
c:\ruby200-x64\devkit\mingw\bin\../lib/gcc/x86_64-w64-ming
w32/4.7.2/../../../../x86_64-w64-mingw32/include/process.h:12:0,
                 from c:/Ruby200-x64/include/ruby-2.0.0/ruby/win32.h:60,
                 from
c:/Ruby200-x64/include/ruby-2.0.0/ruby/defines.h:153,
                 from c:/Ruby200-x64/include/ruby-2.0.0/ruby/ruby.h:70,
                 from c:/Ruby200-x64/include/ruby-2.0.0/ruby.h:33,
                 from em.h:24,
                 from project.h:150,
                 from binder.cpp:20:
c:\ruby200-x64\devkit\mingw\bin\../lib/gcc/x86_64-w64-mingw32/4.7.2/../../../../
x86_64-w64-mingw32/include/sys/types.h:68:16: error: conflicting
declaration 'ty
pedef _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
C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/event
machine-1.0.3 for inspection.
Results logged to
C:/Ruby200-x64/lib/ruby/gems/2.0.0/gems/eventmachine-1.0.3/ext
/gem_make.out

Any help appreciated.

Thanks,

Use 32 bit versions of Ruby and DevKit.

Cheers,