misc/libreoffice build failure

[Marc Baudoin <babafou%babafou.eu.org@localhost>]

Hi,

Just tried to compile misc/libreoffice this morning after the
boost revbump and it fails in the configure phase:

checking What the C++ library is... configure: error: Could not figure out what C++ library this is

The config.log file shows:
g++: error: unrecognized command line option '-std=gnu++14'