--- Libc/Libc-1353.100.2/include/alloca.h
+++ Libc/Libc-1044.1.2/include/alloca.h
@@ -28,11 +28,9 @@
 #include <_types.h>
 #include <sys/_types/_size_t.h>
 
-#ifndef UNIFDEF_DRIVERKIT
 __BEGIN_DECLS
 void	*alloca(size_t);		/* built-in for gcc */
 __END_DECLS
-#endif /* UNIFDEF_DRIVERKIT */
 
 #if defined(__GNUC__) && __GNUC__ >= 3
 /* built-in for gcc 3 */