[Rd] Building R on Windows

[Jennifer Lai]

Hi,
  I"m a newbie on building R on Windows. I followed the instructions 
cited here,
http://www.murdoch-sutherland.com/Rtools/ to build R-2.2.0.
Everything works fine up till when package base needs to be compiled.  
here is the error message,

---------- Making package base ------------
 adding build stamp to DESCRIPTION
Error in library.dynam(lib, package, package.lib) :
       shared library 'tools' not found
Execution halted
make[4]: *** [frontmatter] Error 1
make[3]: *** [all] Error 2
make[2]: *** [pkg-base] Error 2
make[1]: *** [rpackage] Error 2
make: *** [all] Error 2

Has anyone seen this error message before? Where can I find shared 
library tools?

Thanks,
Jennifer