--- src/gle/surface/ffitcontour.cpp.orig	2015-08-16 02:51:24.000000000 -0500
+++ src/gle/surface/ffitcontour.cpp	2018-01-17 20:40:01.000000000 -0600
@@ -43,7 +43,7 @@
 
 /* "f2c.h" defines abs() -- conflict with the definition in <math.h> */
 /* changing the order solves the problem */
-#if ( defined(__OS2__) && defined(__EMX__) ) || defined(__WIN32__)
+#if ( defined(__OS2__) && defined(__EMX__) ) || defined(__WIN32__) || defined(__APPLE__)
 #include <stdio.h>
 #include <math.h>
 #include "f2c.h"