further support of my assumption: http://wine.1045685.n8.nabble.com/Bug-43716-New-freetype-2-8-1-breaks-Wine-build-during-font-conversion-with-sfnt2fon-td5938284.html New: freetype 2.8.1 breaks Wine build during font conversion with sfnt2fon https://bugs.winehq.org/show_bug.cgi?id=43715 Many applications (winecfg, ...) crash on startup with freetype 2.8.1 dpkg says my freetype is 2.9.1-3+deb10u1 --