--- linux-2.6.21.a/drivers/media/usb/pwc/pwc-uncompress.c	2007-04-26 05:08:32.000000000 +0200
+++ linux-2.6.21.b/drivers/media/usb/pwc/pwc-uncompress.c	2007-05-02 14:32:49.000000000 +0200
@@ -26,6 +26,7 @@
    vim: set ts=8:
 */
 
+#include <linux/threads.h>
 #include <asm/current.h>
 #include <asm/types.h>