1 files changed, 0 insertions, 6 deletions
diff --git a/src/sort.c b/src/sort.c
index fd1f4d0a0..7e1e17971 100644
--- a/src/sort.c
+++ b/src/sort.c
@@ -23,15 +23,9 @@
 
 #include <config.h>
 
-/* Get isblank from GNU libc.  */
-#define _GNU_SOURCE
-
 #include <sys/types.h>
 #include <signal.h>
 #include <stdio.h>
-#ifndef ENABLE_ASSERTIONS
-# define NDEBUG 1
-#endif
 #include <assert.h>
 #include "system.h"
 #include "long-options.h"