diff --git a/osx/config.h b/osx/config.h
index f273f679f..30cac1f8e 100644
--- a/osx/config.h
+++ b/osx/config.h
@@ -5,7 +5,7 @@
 #define HAVE_BACKTRACE_SYMBOLS 1
 
 /* Define to 1 if you have the `clock_gettime' function. */
-#define HAVE_CLOCK_GETTIME 1
+/* #undef HAVE_CLOCK_GETTIME */
 
 /* Define to 1 if you have the <curses.h> header file. */
 #define HAVE_CURSES_H 1
@@ -51,7 +51,7 @@
 #define HAVE_MEMORY_H 1
 
 /* Define to 1 if you have the `mkostemp' function. */
-#define HAVE_MKOSTEMP 1
+/* #undef HAVE_MKOSTEMP */
 
 /* Define to 1 if you have the <ncurses/curses.h> header file. */
 /* #undef HAVE_NCURSES_CURSES_H */