doc: document libyang cache bug workaround

Document workaround for CESNET/libyang#752 Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>
FRRouting · Apr 15, 2019 · 03e72d8 · 03e72d8
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commit 03e72d8
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/doc/developer/building-libyang.rst b/doc/developer/building-libyang.rst
@@ -50,6 +50,7 @@ The FRR project builds binary ``libyang`` packages, which we offer for download
    make
    sudo make install
 
-When building libyang on CentOS 6, it's also necessary to pass the
-``-DENABLE_CACHE=OFF`` parameter to cmake.
+When building ``libyang`` version ``0.16.x`` it's also necessary to pass the
+``-DENABLE_CACHE=OFF`` parameter to ``cmake`` to work around a
+`known bug <https://github.com/CESNET/libyang/issues/752>`_ in libyang.