error: POSIX.1-2008 realpath(3) is required on macos

Hi,

I face one issue to build global on macox.
The error is as below when I run configure.

    checking whether POSIX.1-2008 realpath is equipped... no
    configure: error: POSIX.1-2008 realpath(3) is required.

I think #include <stdlib.h> is necessary to call realpath on macOS
environment.
I added

#include <stdlib.h>

in configure then configure is completed and build all tool completed.

I attach patch file.
Please take a look.


The below is detailed information.

What is your environment (OS)?
  macOS 11.2.1

Which version of Global are you using?
  6.6.5

What did you do? (command line)
  After I extract source code then, run the below command.
  ./configure

What did you expect from it?
  ./configure finish without any error

--- configure.bk	2021-02-19 15:48:10.766333301 +0900
+++ configure	2021-02-19 15:49:25.684116399 +0900
@@ -14286,6 +14286,7 @@
 else
   cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
+#include <stdlib.h>
 
 main(){ (void)realpath("/./tmp", (void *)0); return 0; }