Include "sane/sanei.h" to make sure the prototype match the function.

sanei/sanei_constrain_value.c

@@ -45,6 +45,7 @@
 #include <sys/types.h>
 
 #include "sane/sane.h"
+#include "sane/sanei.h"
 
 SANE_Status
 sanei_constrain_value (const SANE_Option_Descriptor * opt, void * value,

sanei/sanei_load_values.c

@@ -70,6 +70,7 @@
 #endif
 
 #include "sane/sane.h"
+#include "sane/sanei.h"
 #include "sane/sanei_wire.h"
 #include "sane/sanei_codec_ascii.h"
 

sanei/sanei_save_values.c

@@ -48,6 +48,7 @@
 #endif
 
 #include "sane/sane.h"
+#include "sane/sanei.h"
 #include "sane/sanei_wire.h"
 #include "sane/sanei_codec_ascii.h"