Index: src/libcfa/concurrency/threads
===================================================================
--- src/libcfa/concurrency/threads	(revision 596f987b3b97b71c5ffd2f87a1b6f90e82761547)
+++ src/libcfa/concurrency/threads	(revision d3a85240d62ba5144799969643c3c4b42e28bef0)
@@ -15,6 +15,8 @@
 //
 
-#ifndef __THREADS_H__
-#define __THREADS_H__
+#ifdef __CFORALL__
+
+#ifndef THREADS_H
+#define THREADS_H
 
 #include "assert"       //
@@ -111,5 +113,9 @@
 }
 
-#endif //__THREADS_H__
+#endif //THREADS_H
+
+#else
+#include_next <thread>
+#endif //__CFORALL__
 
 // Local Variables: //