Add xmsprintf(), xgetcwd(), xgetcwd(), find_in_path().
diff --git a/toys.h b/toys.h
index 9460d36..e84736a 100644
--- a/toys.h
+++ b/toys.h
@@ -12,6 +12,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <strings.h>
+#include <sys/stat.h>
 #include <unistd.h>
 
 #include "lib/lib.h"