Index: uspace/lib/posix/src/internal/common.h
===================================================================
--- uspace/lib/posix/src/internal/common.h	(revision df2e5514fa8f0044ee3ce752a6fd5cf72425718e)
+++ uspace/lib/posix/src/internal/common.h	(revision 5b0cf635022b821f28f7a014ad5b39d005cd7666)
@@ -50,4 +50,7 @@
 	} while (0)
 
+// Just a marker for external tools.
+#define _HIDE_LIBC_SYMBOL(symbol)
+
 /* Checks if the value is a failing error code.
  * If so, writes the error code to errno and returns true.