error: '__u32' undeclared (first use in this function)

Index: backend/v4l.c
--- backend/v4l.c.orig
+++ backend/v4l.c
@@ -59,6 +59,7 @@
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <unistd.h>
+#include <stdint.h>
 #include <sys/mman.h>
 
 #include <unistd.h>
@@ -83,6 +84,10 @@
 
 #include <libv4l1.h>
 #include "v4l.h"
+
+#if !defined(__linux__) 
+typedef uint32_t __u32;
+#endif
 
 static const SANE_Device **devlist = NULL;
 static int num_devices;