Hello! For the record, the build failure on armel, arm64 and mipsel is because of the gtk-reftest test failing.
(On mips the build seems to hang and eventually get killed for unknown reason.) A test build has been performed on armel schroot on a porter box (abel) and the problem is reproducible. As can be seen in the attached output from gtk-reftest there are spurious pixels in the output. A brief discussion with upstream developer Benjamin Otte suggested that one possible cause for this might be (incorrect/failing?) optimizations in pixman being different on different architectures, but real investigation is needed. Other non-armel failing architectures have not been tested. Regards, Andreas Henriksson