diff -up src/xqproxy-git/configure.ac.orig src/xqproxy-git/configure.ac
--- src/xqproxy-git/configure.ac.orig	2014-04-02 21:53:12.000000000 -0600
+++ src/xqproxy-git/configure.ac	2014-04-02 21:53:19.000000000 -0600
@@ -23,7 +23,7 @@ if test "x$GCC" = "xyes"; then
 fi
 
 PKG_CHECK_MODULES(libxdmcp, [
-        xdmcp >= 1.0.0
+        xdmcp >= 1.0.0 x11
 ])
 AC_SUBST(libxdmcp_LIBS)
 AC_SUBST(libxdmcp_CFLAGS)
diff -up src/xqproxy-git/xdmcpclient.c.orig src/xqproxy-git/xdmcpclient.c
--- src/xqproxy-git/xdmcpclient.c.orig	2014-04-02 21:54:04.000000000 -0600
+++ src/xqproxy-git/xdmcpclient.c	2014-04-02 21:54:12.000000000 -0600
@@ -264,7 +264,7 @@ XdmcpClientFree (XdmcpClient *client)
     XdmcpDisposeARRAY8 (&client->DisplayClass);
     XdmcpDisposeARRAY8 (&client->DisplayID);
     if (client->buffer.data)
-        Xfree (client->buffer.data);
+        XFree (client->buffer.data);
     free (client);
 }