Trying to fix #2676 (https://travis-ci.org/lino-framework/book/jobs/457279405)
Trying to fix #2676 (https://travis-ci.org/lino-framework/book/jobs/457279405)

lsaffre/lino,lino-framework/lino,lino-framework/lino,lino-framework/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino,lino-framework/lino,lsaffre/lino,lsaffre/lino