Index: kernel/generic/include/lib/memfnc.h
===================================================================
--- kernel/generic/include/lib/memfnc.h	(revision 15c9b26d8757f049a20696129dd6eeb4722d6041)
+++ kernel/generic/include/lib/memfnc.h	(revision 618d02a32e850e34b3debf49445c652badf036eb)
@@ -41,4 +41,6 @@
 extern void *memcpy(void *, const void *, size_t);
 
+#define alloca(size) __builtin_alloca((size))
+
 #endif