diff -ru a/sanei/sanei_pio.c b/sanei/sanei_pio.c
--- a/sanei/sanei_pio.c	2019-03-01 10:44:36.723260142 -0600
+++ b/sanei/sanei_pio.c	2019-03-01 10:48:47.660693036 -0600
@@ -73,6 +73,7 @@
 #elif HAVE_SYS_HW_H
 # include <sys/hw.h>
 #elif defined(__i386__)  && defined (__GNUC__)
+#include <sys/types.h>
 
 static __inline__ void
 outb (u_char value, u_long port)