title: Can Not Install XML Package
body: <p>I can not install the latest XML package V3.9-4. 
  I mannually install it in RGui by typing:</p>
  
  <pre><code>install.packages("LOCALDIR/XML_3.6-0.tar.gz", repos=NULL, type="source")
  </code></pre>
  
  <p>But get some error message:</p>
  
  <pre><code>* installing *source* package 'XML' ...
  Please define LIB_XML (and LIB_ZLIB, LIB_ICONV)
  ERROR: configuration failed for package 'XML'
  * removing 'LOCALDIR/R/win-library/2.12/XML'
  * restoring previous 'LOCALDIR/R/win-library/2.12/XML'
  </code></pre>
  
  <p>Anyone any idea?</p>
  
  <p>Thx!</p>