sbuild not working

[john564]

A few errors,

firstly config/variants.conf has stretch which isn't supported, the scripts stop

after removing stretch from config/variants.conf, I can get as far as scripts/build-all.sh
but it again stops

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• cd /root/sbuild_wrapper/build/buster
  ++ pwd
• sbuild --verbose --no-run-lintian --build-dir=/root/sbuild_wrapper/build/buster --arch=i386 --dist=buster openvpn_2.5.8-buster0.dsc
  Unknown option: build-dir
  E: Error parsing command-line options

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Perhaps, you need to do a test run to find the bugs.
thanks for everything, much appreciated