Index: uspace/lib/c/include/string.h
===================================================================
--- uspace/lib/c/include/string.h	(revision 208db5ac8515f1f9a7936d74f0371c0ba4f5bf48)
+++ uspace/lib/c/include/string.h	(revision 3875f1064135338c90e634c95c82359a59d27007)
@@ -36,5 +36,5 @@
 #define LIBC_STRING_H_
 
-#ifdef _HELENOS_SOURCE
+#if defined(_HELENOS_SOURCE) && !defined(_REALLY_WANT_STRING_H)
 #error Please use str.h and mem.h instead
 #endif