diff --git a/libc/include/alloca.h b/libc/include/alloca.h
new file mode 100644
index 00000000..a2941463
--- /dev/null
+++ b/libc/include/alloca.h
@@ -0,0 +1,8 @@
+/* alloca.h: Stack memory allocation. */
+
+#ifndef _ALLOCA_H
+#define _ALLOCA_H
+
+#define alloca __builtin_alloca
+
+#endif