Correct use of long instead of off_t for file size. (James Vega)
diff --git a/src/os_win32.h b/src/os_win32.h
index b57ee23..527d8c7 100644
--- a/src/os_win32.h
+++ b/src/os_win32.h
@@ -93,6 +93,7 @@
 
 #include <stdlib.h>
 #include <time.h>
+#include <sys/types.h>
 
 #ifndef STRICT
 # define STRICT