--- src/terminal-util.c.orig	2017-09-13 13:44:09.000000000 -0700
+++ src/terminal-util.c	2017-09-13 13:46:36.000000000 -0700
@@ -30,6 +30,22 @@
 #include <langinfo.h>
 #include <errno.h>
 
+#ifdef __APPLE__
+
+/* As of Sierra, Mac OS X, macOS does not provide strchrnul()  */
+/* Find the first occurrence of C in S or the final NUL byte.  */
+
+static char *
+strchrnul (const char *s, int c_in)
+{
+  char c = c_in;
+  while (*s && (*s != c))
+    s++;
+
+  return (char *) s;
+}
+
+#endif
 #include <glib.h>
 #include <glib/gi18n.h>