Anyone running into

make sysprep

related to glibc ? It attempts to build locales that are mapped from the environment:

tools/provision/formula/glibc.rb +54: locales = ENV.map { |k, v| v if k[/^LANG$|^LC_/] && v != "C" }.compact

And for some pathological reason, a macOS host (Terminal.app, iTerm2) insist on setting

LC_CTYPE=UTF-8

. So this manifests it self when ssh'ing into the vagrant box to due the default

SendEnv LANG LC_*

in ssh_config.