XXX patch manually created with diff(1) to remove the CVS Id from the file.

errno.h header is required now that errno is a per-thread variable.
"undefined symbol 'errno'" at runtime with dlopen()'d modules.

Index: backend/sm3600-scanusb.c
--- backend/sm3600-scanusb.c.orig
+++ backend/sm3600-scanusb.c
@@ -47,6 +47,7 @@ Userspace scan tool for the Microtek 3600 scanner
 
 ====================================================================== */
 
+#include <errno.h>
 #include "sm3600-scantool.h"
 
 /* **********************************************************************