Index: config.h.in
--- config.h.in.orig
+++ config.h.in
@@ -412,8 +412,3 @@
 
 /* Define for large files, on AIX-style hosts. */
 #undef _LARGE_FILES
-
-/* The targeted POSIX standard. */
-#ifndef _POSIX_C_SOURCE
-# define _POSIX_C_SOURCE 200112L
-#endif