I used to write post about install ruby 2.0.0-p195 in windows one years ago, the ruby language improved a lot this year and it's gems. But windows platform is still not active compare with Mac OS X or Linux in rubyist.

There are two thick I believe worth to write down for the windows rubyist:

Install debugger

1. clone the debugger-ruby_core_source to local folder, e.g. C:\git\debugger-ruby_core_source
2. copy C:\git\debugger-ruby_core_source\lib to C:\Ruby200\lib\ruby\gems\2.0.0\gems\debugger-ruby_core_source-1.3.2
3. gem install debugger.

Install bson

Modify the win32.h file (@C:\Ruby200\include\ruby-2.0.0\ruby) before install gems bson

static inline double
rb_w32_pow(double x, double y)
{
    return powl(x, y);
}
#elif defined(__MINGW64_VERSION_MAJOR)
 
#ifndef _PC_64
#define _PC_64 0x00000000
#endif
 
#ifndef _MCW_PC
#define _MCW_PC 0x00030000
#endif
 
/*
 * Set floating point precision for pow() of mingw-w64 x86.
 * With default precision the result is not proper on WinXP.
 */