diff --git a/util/LLgen/src/alloc.c b/util/LLgen/src/alloc.c
index 0580b4a9..25ca26d6 100644
--- a/util/LLgen/src/alloc.c
+++ b/util/LLgen/src/alloc.c
@@ -16,6 +16,7 @@
  * Interface to malloc() and realloc()
  */
 
+#include <stdlib.h>
 # include "types.h"
 # include "extern.h"
 
@@ -31,7 +32,6 @@ alloc(size) unsigned size; {
 	   Allocate "size" bytes. Panic if it fails
 	 */
 	p_mem	p;
-	p_mem	malloc();
 
 	if ((p = malloc(size)) == 0) fatal(linecount,e_nomem);
 	return p;
@@ -43,8 +43,6 @@ ralloc(p,size) p_mem p; unsigned size; {
 	   Re-allocate the chunk of memory indicated by "p", to
 	   occupy "size" bytes
 	 */
-	p_mem	realloc();
-
 	if ((p = realloc(p,size)) == 0) fatal(linecount,e_nomem);
 	return p;
 }
diff --git a/util/LLgen/src/check.c b/util/LLgen/src/check.c
index 2c974aec..21d8a9f9 100644
--- a/util/LLgen/src/check.c
+++ b/util/LLgen/src/check.c
@@ -16,6 +16,8 @@
  * Several routines to perform checks and printouts
  */
 
+#include <stdlib.h>
+#include <string.h>
 # include "types.h"
 # include "extern.h"
 # include "io.h"
diff --git a/util/LLgen/src/main.c b/util/LLgen/src/main.c
index 82b88d3a..733c0d81 100644
--- a/util/LLgen/src/main.c
+++ b/util/LLgen/src/main.c
@@ -16,6 +16,8 @@
  * Contains main program, and some error message routines
  */
 
+#include <stdlib.h>
+#include <string.h>
 # include "types.h"
 # include "io.h"
 # include "extern.h"