title: Adding Linker Flags in Xcode
body: <p>(I'm not sure if "flag" is the word I'm looking for, but I'll explain it.)</p>
  
  <p>I am trying to compile a program that uses the <a href="http://gmplib.org/" rel="noreferrer">GMP</a> big number library. But to be able to compile with GMP, I have to add <code>-lgmp</code> to the end of the command. For example, if I want to compile "program.c", I have to type <code>gcc program.c -lgmp</code>. This is easy from the command line, but I don't see how to do it in Xcode. How can I add the <code>lgmp</code> flag while using Xcode?</p>