title: Installed gmp but can't see it
body: <p>To compile my own gcc, I require <a href="http://gmplib.org/" rel="nofollow">gmp</a>. Therefore, I downloaded a tarball of gmp, and installed it by the usual steps of configure, make and make install. However, afterwards, I can't see any gmp in my system by typing 'which gmp'. So my question is where is gmp hidden? I am using CentOS 5.6.</p>
  
  <h2>EDIT</h2>
  
  <p>OK, I can see the header and library files of gmp in /usr/local/include and /usr/local/lib. I used <code>--with-gmp-include=/usr/local/include --with-gmp-lib=/usr/local/lib</code> but the gcc's configure still complains about not finding gmp. What is going on here?</p>