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diff --git a/src/alloc.h b/src/alloc.h
index 50e7ab1f..b1b1cc5e 100644
--- a/src/alloc.h
+++ b/src/alloc.h
@@ -22,10 +22,23 @@
 
 #include <stddef.h>
 
-/* Functions. */
+/* malloc() wrapper functions. */
 void *xmalloc (size_t size);
 void *xcalloc (size_t size);
 void *xrealloc (void *ptr, size_t size);
 char *xstrdup (const char *s);
+void out_of_memory (void) NO_RETURN;
+
+/* alloca() wrapper functions. */
+#if defined (HAVE_ALLOCA) || defined (C_ALLOCA)
+#ifdef HAVE_ALLOCA_H
+#include <alloca.h>
+#endif
+#define local_alloc(X) alloca (X)
+#define local_free(P) ((void) 0)
+#else
+#define local_alloc(X) xmalloc (X)
+#define local_free(P) free (P)
+#endif
 
 #endif /* alloc.h */