-[ $# -gt 0 ] && CONFIGURE_ARGS=" $@" || CONFIGURE_ARGS=""
-[ -z "$GO" -a -n "$CONFIGURE_ARGS" ] && GO=1
+AUTOCONF_VERSION=$(echo "$AUTOCONF" | cut -d'-' -f2-)
+[ -n "$AUTOCONF_VERSION" ] && [ "$AUTOCONF_VERSION" != "autoconf" ] \
+ && export AUTOCONF_VERSION || unset AUTOCONF_VERSION
+[ "$VERBOSE" = "1" ] && echo " - AUTOCONF_VERSION=$AUTOCONF_VERSION"
+AUTOMAKE_VERSION=$(echo $AUTOMAKE | cut -d'-' -f2-)
+[ -n "$AUTOMAKE_VERSION" ] && [ "$AUTOMAKE_VERSION" != "automake" ] \
+ && export AUTOMAKE_VERSION || unset AUTOMAKE_VERSION
+[ "$VERBOSE" = "1" ] && echo " - AUTOMAKE_VERSION=$AUTOMAKE_VERSION"
+
+[ $# -gt 0 ] && CONFIGURE_ARGS=" $*" || CONFIGURE_ARGS=""
+[ -z "$GO" ] && [ -n "$CONFIGURE_ARGS" ] && GO=1