Here's the output of fc-match 'DejaVu Sans' in case you need it. DejaVuSans.ttf: "DejaVu Sans" "Book"
Sorry for triple posting on the other bug report. My mistake I sent posted the same message twice, then when trying to post the same message in this bug report I reported it to the other bug report by mistake. Here's also the output of fc-match 'DejaVu Sans Condensed' DejaVuSansCondensed.ttf: "DejaVu Sans Condensed" "Condensed" I've also checked and it the same thing happens with DejaVu Serif: GTK3 programs use DejaVu Serif Book instead of DejaVu Serif Condensed.