workaround doc build failure refs #772  doc build fails
workaround doc build failure
refs #772  doc build fails

ebollens/ccnmp,cawka/ndnx,ebollens/ccnmp,svartika/ccnx,cawka/ndnx,svartika/ccnx,svartika/ccnx,ebollens/ccnmp,cawka/ndnx,svartika/ccnx,ebollens/ccnmp,svartika/ccnx,svartika/ccnx,cawka/ndnx,cawka/ndnx,svartika/ccnx