I was misguided by libdtc warnings, and thought bison/flex were required to build QEMU, so installed them in docker (and they also ended in the VM scripts).
Claudio's series "libfdt: build only the strict necessary" even silents the warnings. Based-on: <20200514193811.6798-1-cfont...@suse.de> Philippe Mathieu-Daudé (2): tests/docker: Remove flex/bison packages tests/vm: Remove flex/bison packages tests/docker/dockerfiles/centos7.docker | 2 -- tests/docker/dockerfiles/centos8.docker | 2 -- tests/docker/dockerfiles/debian-xtensa-cross.docker | 2 -- tests/docker/dockerfiles/debian10.docker | 2 -- tests/docker/dockerfiles/debian9.docker | 2 -- tests/docker/dockerfiles/fedora.docker | 2 -- tests/docker/dockerfiles/ubuntu.docker | 2 +- tests/docker/dockerfiles/ubuntu1804.docker | 2 +- tests/vm/fedora | 1 - tests/vm/freebsd | 1 - tests/vm/netbsd | 1 - tests/vm/ubuntu.i386 | 2 +- 12 files changed, 3 insertions(+), 18 deletions(-) -- 2.21.3