--- Libc/Libc-391.5.21/include/standards.h
+++ Libc/Libc-320.1.3/include/standards.h
@@ -27,11 +27,11 @@
 #ifndef _STANDARDS_H
 #define _STANDARDS_H
 
-#ifdef _POSIX_C_SOURCE
+#ifdef _POSIX_SOURCE
 #        ifndef __STRICT_ANSI__
 #                define __STRICT_ANSI__
 #        endif
 #        undef __STRICT_BSD__
-#endif /* _POSIX_C_SOURCE */
+#endif /* _POSIX_SOURCE */
 
 #endif /* _STANDARDS_H */