graphviz library is missed from the requirements

[shorman88]

Inorder to make Call graph working you need to install graphviz graphviz-devel graphviz-gd and enable it in the config.php.

$_xhprof['dot_binary'] = '/usr/bin/dot';
$_xhprof['dot_tempdir'] = '/tmp';
$_xhprof['dot_errfile'] = '/tmp/xh_dot.err';

Please add graphviz to the requirements.

Thanks

Ayman

[aik099]

The graphviz package itself is listed in README, but graphviz-devel and graphviz-gd are not.

Please send a PR for adding them.