Topic: Error while installing rcov in Windows 7 -64 bit


I faced the following issue while installing rcov in my system(Windows 7 -64 bit):

C:\Ruby187>gem install rcov
Temporarily enhancing PATH to include DevKit...
Building native extensions.  This could take a while...
ERROR:  Error installing rcov:
        ERROR: Failed to build gem native extension.

    C:/Ruby187/bin/ruby.exe extconf.rb
creating Makefile

Makefile:121: *** target pattern contains no `%'.  Stop.

Gem files will remain installed in C:/Ruby187/lib/ruby/gems/1.8/gems/rcov-1.0.0
for inspection.
Results logged to C:/Ruby187/lib/ruby/gems/1.8/gems/rcov-1.0.0/ext/rcovrt/gem_ma

Devkit has also been installed and tried, but still not able to install rcov.

Note: I am trying to install rcov in Windows 7-64 bit machine

Please guide me.