Index: uspace/lib/libc/include/unistd.h
===================================================================
--- uspace/lib/libc/include/unistd.h	(revision db24058f476a95ab9afb349b07aba2936c53ed79)
+++ uspace/lib/libc/include/unistd.h	(revision 5e53e02708b7fe7afa7635c8ea1a0738d1329937)
@@ -51,4 +51,6 @@
 #endif
 
+extern int dup2(int oldfd, int newfd);
+
 extern ssize_t write(int, const void *, size_t);
 extern ssize_t read(int, void *, size_t);