title: gmp is missing while configuring building gdb from source
body: <p>I am trying to build gdb from source, which version is 11.1.
  I have configured the GMP including path, but the configure script still report an error.</p>
  <pre><code>configure: error: GMP is missing or unusable
  </code></pre>
  <p>I copied the config log.</p>
  <pre><code>configure:10433: checking for libgmp
  configure:10453: gcc -o conftest -g -O2      conftest.c -lncurses -lm -ldl  -lgmp &gt;&amp;5
  conftest.c:53:17: fatal error: gmp.h: No such file or directory
  
  </code></pre>
  <p>My configure command is something like below.</p>
  <pre><code>configure --prefix=/home/xxx/ins/gdb_11 --with-gmp-include=/home/xxx/ins/gmp-6.2.1/include --with-gmp-lib=/home/xxx/ins/gmp-6.2.1/lib
  </code></pre>
  <p>What might the problem be?</p>