Index: uspace/lib/libc/include/unistd.h
===================================================================
--- uspace/lib/libc/include/unistd.h	(revision 4db6eaf06a371efbb5d1f20919cbf3e224a20036)
+++ uspace/lib/libc/include/unistd.h	(revision 7fff5eab4db78f93413ceae2f73966e318e1a0aa)
@@ -42,6 +42,12 @@
 #define getpagesize()     (PAGE_SIZE)
 
+#define SEEK_SET	0
+#define SEEK_CUR	1
+#define SEEK_END	2
+
 extern ssize_t write(int fd, const void * buf, size_t count);
 extern ssize_t read(int fd, void * buf, size_t count);
+extern off_t lseek(int, off_t, int);
+
 extern void _exit(int status);
 extern void *sbrk(ssize_t incr);