openclipart 1:0.18+dfsg-16 is marked for autoremoval from testing on 2020-03-31
It is affected by these RC bugs: 953866: openclipart: please add a explicit build-dependency on libreoffice-core (FTBFS: /usr/lib/libreoffice/program/gengal.bin: symbol lookup error: /usr/lib/libreoffice/program/gengal.bin: undefined symbol: _Z10getGlxPipev)