added build problem to the knwon problems page for 2.1.13

documentation/Installation.txt

@@ -44,7 +44,7 @@ Older releases can be downloaded by following the links here:
    ========= =========================== ============================
    Version   Release Notes               Known Problems
    ========= =========================== ============================
-   `2.1.13`_ :ref:`Release_Notes_2.1.13` n/a
+   `2.1.13`_ :ref:`Release_Notes_2.1.13` :ref:`Known_Problems_2.1.13`
    `2.1.12`_ :ref:`Release_Notes_2.1.12` :ref:`Known_Problems_2.1.12`
    `2.1.11`_ :ref:`Release_Notes_2.1.11` n/a
    `2.1.10`_ :ref:`Release_Notes_2.1.10` :ref:`Known_Problems_2.1.10`

documentation/KnownProblems.txt

 Known Problems
 ==============
 
+.. _Known_Problems_2.1.13:
+
+Known Problems in Release 2.1.13
+--------------------------------
+
+Building the tests fails with older base releases (e.g. 3.14.8).
+A fix is available and will be part of the next release. Until then,
+see the `latest snapshot`_ or pull from the darcs repository.
+
+.. _latest snapshot: http://www-csr.bessy.de/control/SoftDist/sequencer/releases/seq-snapshot-latest.tar.gz
+
 .. _Known_Problems_2.1.12:
 
 Known Problems in Release 2.1.12