Index: uspace/lib/posix/include/posix/stdio.h
===================================================================
--- uspace/lib/posix/include/posix/stdio.h	(revision be2bb4fffd12b3c1f21bcedf9d1a0ca6a5ef26b9)
+++ uspace/lib/posix/include/posix/stdio.h	(revision bf963b974946a646a6aa179d1383242007f4047a)
@@ -65,7 +65,4 @@
 
 #define BUFSIZ  4096
-#define SEEK_SET  0
-#define SEEK_CUR  1
-#define SEEK_END  2
 
 typedef struct _IO_FILE FILE;
Index: uspace/lib/posix/include/posix/unistd.h
===================================================================
--- uspace/lib/posix/include/posix/unistd.h	(revision be2bb4fffd12b3c1f21bcedf9d1a0ca6a5ef26b9)
+++ uspace/lib/posix/include/posix/unistd.h	(revision bf963b974946a646a6aa179d1383242007f4047a)
@@ -44,4 +44,8 @@
 #include "stddef.h"
 
+#define SEEK_SET  0
+#define SEEK_CUR  1
+#define SEEK_END  2
+
 /* Process Termination */
 #define _exit exit
@@ -77,4 +81,6 @@
 extern ssize_t __POSIX_DEF__(read)(int fildes, void *buf, size_t nbyte);
 extern ssize_t __POSIX_DEF__(write)(int fildes, const void *buf, size_t nbyte);
+extern __POSIX_DEF__(off_t) __POSIX_DEF__(lseek)(int fildes,
+    __POSIX_DEF__(off_t) offset, int whence);
 extern int __POSIX_DEF__(fsync)(int fildes);
 extern int __POSIX_DEF__(ftruncate)(int fildes, __POSIX_DEF__(off_t) length);