diff -Nru skdet-1.0/src/skdet.c skdet-1.0-fixed/src/skdet.c
--- skdet-1.0/src/skdet.c	2005-01-04 22:12:23.000000000 -0500
+++ skdet-1.0-fixed/src/skdet.c	2010-03-14 14:01:58.000000000 -0400
@@ -2,6 +2,7 @@
 
 #include <stdio.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <sys/types.h>
 
 int main(int argc, char *argv[])
diff -Nru skdet-1.0/src/usage.c skdet-1.0-fixed/src/usage.c
--- skdet-1.0/src/usage.c	2005-01-04 22:10:54.000000000 -0500
+++ skdet-1.0-fixed/src/usage.c	2010-03-14 14:02:12.000000000 -0400
@@ -1,6 +1,7 @@
 /* usage.c - print usage information */
 
 #include <stdio.h>
+#include <stdlib.h>
 #include "../include/skdet.h"
 
 void usage(char *prog)