Index: uspace/lib/posix/unistd.c
===================================================================
--- uspace/lib/posix/unistd.c	(revision fb90deb97a9150b88c9d015fcaaf33d2f1291e14)
+++ uspace/lib/posix/unistd.c	(revision 32fb694425a16735e357738d8cd54dde9216dde8)
@@ -40,12 +40,13 @@
 
 /**
- * 
+ * Dummy function. Always returns false, because there is no easy way to find
+ * out under HelenOS.
+ *
  * @param fd
- * @return
+ * @return Always false.
  */
 int posix_isatty(int fd)
 {
-	// TODO
-	not_implemented();
+	return false;
 }