#function configure
if [[ $PREFIX = *=* ]]; then
  # Complete filenames after e.g. --prefix=
  IPREFIX=${PREFIX%%=*}=
  PREFIX=${PREFIX#*=}
  complist -f
else
  # Generate a list of options from configure --help
  complist -s '$($COMMAND --help |
  sed -n -e '\''s/^ *\(--[-a-z0-9]*\)[    =,].*$/\1/p'\'')'
fi