diff --git a/Mac/Include/config.h b/Mac/Include/config.h
index 8c768e0b257..2a790254b8d 100644
--- a/Mac/Include/config.h
+++ b/Mac/Include/config.h
@@ -1,11 +1,10 @@
 /* config.h.in.  Generated automatically from configure.in by autoheader.  */
 
-/* Define if on Macintosh, compiling with THINK C. */
-#define THINK_C
-
-/* Define if on Macintosh, compiling with anyu C compiler. */
+/* Define if on Macintosh, compiling with any C compiler. */
 #define macintosh
 
+#define HAVE_STDARG_PROTOTYPES 1
+
 /* Define if on AIX 3.
    System headers sometimes define this.
    We just want to avoid a redefinition error message.  */
@@ -142,6 +141,9 @@
 /* Define if you have setsid.  */
 #undef HAVE_SETSID
 
+/* Define if you have setvbuf.  */
+#define HAVE_SETVBUF 1
+
 /* Define if you have siginterrupt.  */
 #undef HAVE_SIGINTERRUPT