[webkit-help] Build error

[Marcolippo Polpettino]

I'm building webkit for the first time, on windows, visual c++ 2005 express
This is what I get as soon as I run the build script.
What can I do? 
Thanks in advance.

Performing Pre-Build Event...
/usr/bin/bash
Project : error PRJ0002 : Error result 1 returned from 'C:\WINDOWS\system32\cmd.exe'.
Project : warning PRJ0018 : The following environment variables were not found:
$(PRODUCTION)
 		 	   		  
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