+#### Set up new configuration.
+#### Put it in a file so we don't have to mess with shell quoting. It
+#### would get tricky with configure options that can contain embedded
+#### spaces, such as --enable-masquerade and --with-smtpservers.
+reconfig=reconfig-for-test
+echo 'set '/bin/sh' './configure' \' > $reconfig
+#### Configure allows multiple --prefix but ignores all but the last.
+#### So add the one we want to use. This is easier than trying to change
+#### an existing --prefix, esp. if it has quoted characters.
+echo $(./config.status --config) \'--prefix="$installdir"\' >> $reconfig
+echo 'exec "$@"' >> $reconfig