> W: libboost1.65-doc: privacy-breach-generic > usr/share/doc/libboost1.65-doc/HTML/libs/assert/doc/html/assert.html > (https://fonts.googleapis.com/css?family=open+sans:300,300italic,400,400italic,600,600italic%7cnoto+serif:400,400italic,700,700italic%7cdroid+sans+mono:400,700)
Both Open Sans and Noto are available as Debian packages. May I suggest adding a Recommends: fonts-open-sans if it isn't already there? This doesn't actually help with the document building process, but at least the presentation is covered.
