diff --git a/lib/dup.c b/lib/dup.c
new file mode 100644
index 0000000..dd13414
--- /dev/null
+++ b/lib/dup.c
@@ -0,0 +1,10 @@
+/*
+ *  linux/lib/dup.c
+ *
+ *  (C) 1991  Linus Torvalds
+ */
+
+#define __LIBRARY__
+#include <unistd.h>
+
+_syscall1(int,dup,int,fd)