otb 6.6.1+dfsg-3 is marked for autoremoval from testing on 2019-09-18 It (build-)depends on packages with these RC bugs: 875075: openscenegraph: [openscenegraph] Future Qt4 removal from Buster 935086: insighttoolkit4: FTBFS with GCC-9: use of undeclared identifier '__builtin_is_constant_evaluated'