diff -Nuar hardlink++-0.02/hardlink.h
--- hardlink++-0.02.orig/hardlink.h	2008-12-11 12:57:24.563543862 -0800
+++ hardlink++-0.02/hardlink.h	2008-12-11 13:02:56.091753425 -0800
@@ -39,6 +39,7 @@
 
 // C includes
 #include <unistd.h>
+#include <stdlib.h>
 #include <dirent.h>
 #include <sys/stat.h>