--- a/decodeselfid.c
+++ b/decodeselfid.c
@@ -25,6 +25,8 @@
 
 #include "decodeselfid.h"
 
+#include <string.h>
+
 void printbin(FILE *stream, unsigned int i, unsigned char width) {
 	int j;
 	for (j=0; j<width; j++) {
--- a/fatal.c
+++ b/fatal.c
@@ -18,6 +18,8 @@
  */
 #include "fatal.h"
 
+#include <stdlib.h>
+
 void fatal(char *s) {
 	fprintf(stderr, "Error: %s\n", s);
 	exit(1);