#compdef env

if _pick_variant gnu=Free\ Soft unix --version; then
  _arguments \
    '(--ignore-environment -i)'{-i,--ignore-environment}'[start with empty environment]' \
    '(--unset= -u)'{-u,--unset=}'[remove variable from the environment]:env var to remove:compadd ${(k)parameters[(R)*export*]}' \
    '--help[help]' \
    '--version[version]' \
    '*::arguments: _normal'
else
  _precommand
fi