--with-build-jdk and --with-boot-jdk not working with JDK 10

configure for jdk10 is giving me the following error:

configure: Found potential Build JDK using configure arguments
configure: Potential Build JDK found at /local/ws/jdk10/hs6/build/linux-x64/images/jdk is incorrect JDK version (java version "10-internal"); ignoring
configure: (Your Build JDK must be version 9)

Note I was able to configure and build linux-x64 (without using --with-build-jdk), but for linux-x64-debug I'm adding the following:

  --with-build-jdk=`pwd`/build/linux-x64/images/jdk

Seems the following code should be updated to 10:

        [FOUND_CORRECT_VERSION=`echo $BUILD_JDK_VERSION | $EGREP '\"9([\.+-].*)?\"'`]
        if test "x$FOUND_CORRECT_VERSION" = x; then
          AC_MSG_NOTICE([Potential Build JDK found at $BUILD_JDK is incorrect JDK version ($BUILD_JDK_VERSION); ignoring])
          AC_MSG_NOTICE([(Your Build JDK must be version 9)])
          BUILD_JDK_FOUND=no
        else