AC_DEFUN([AI_CHECK_ORB],
    [
        AC_MSG_NOTICE([checking for a supported ORB...])

        AC_ARG_ENABLE(
            [omniorb],
            AS_HELP_STRING(--enable-omniorb,use omniORB),
            [
                USE_OMNIORB="${enableval}"
            ],
            [
                USE_OMNIORB=""
            ])
        AC_ARG_ENABLE(
            [mico],
            AS_HELP_STRING(--enable-mico,use MICO),
            [
                USE_MICO="${enableval}"
            ],
            [
                USE_MICO=""
            ])
        AC_ARG_ENABLE(
            [tao],
            AS_HELP_STRING(--enable-tao,use TAO),
            [
                USE_TAO="${enableval}"
            ],
            [
                USE_TAO=""
            ])
        AC_ARG_ENABLE(
            [orbitcpp],
            AS_HELP_STRING(--enable-orbitcpp,use orbitcpp),
            [
                USE_ORBITCPP="${enableval}"
            ],
            [
                USE_ORBITCPP=""
            ])
        AC_ARG_ENABLE(
            [orbacus],
            AS_HELP_STRING(--enable-orbacus,use ORBacus),
            [
                USE_ORBACUS="${enableval}"
            ],
            [
                USE_ORBACUS=""
            ])
        AC_ARG_ENABLE(
            [visibroker],
            AS_HELP_STRING(--enable-visibroker,use VisiBroker),
            [
                USE_VISIBROKER="${enableval}"
            ],
            [
                USE_VISIBROKER=""
            ])
            
        checkOmniorb()
        {
            AI_CHECK_OMNIORB
            test "x${OMNIORB}" = "xyes"
        }
        checkMico()
        {
            AI_CHECK_MICO
            test "x${MICO}" = "xyes"
        }
        checkTao()
        {
            AI_CHECK_TAO
            test "x${TAO}" = "xyes"
        }
        checkOrbitcpp()
        {
            AI_CHECK_ORBITCPP
            test "x${ORBITCPP}" = "xyes"
        }
        checkOrbacus()
        {
            AI_CHECK_ORBACUS
            test "x${ORBACUS}" = "xyes"
        }
        checkVisibroker()
        {
            AI_CHECK_VISIBROKER
            test "x${VISIBROKER}" = "xyes"
        }

        findOrb()
        {
            ORB="yes"
        
            AI_CONTINUE_ORB_CHECKS="yes"        
            dnl Try user's preferences (--enable-xxx options).
            if test "x${AI_CONTINUE_ORB_CHECKS}" = "xyes"
            then
                if test "x${USE_OMNIORB}" = "xyes"
                then
                    AI_CONTINUE_ORB_CHECKS="no"
                    if checkOmniorb
                    then
                        return
                    fi
                fi
                if test "x${USE_MICO}" = "xyes"
                then
                    AI_CONTINUE_ORB_CHECKS="no"
                    if checkMico
                    then
                        return
                    fi
                fi
                if test "x${USE_TAO}" = "xyes"
                then
                    AI_CONTINUE_ORB_CHECKS="no"
                    if checkTao
                    then
                        return
                    fi
                fi
                if test "x${USE_ORBITCPP}" = "xyes"
                then
                    AI_CONTINUE_ORB_CHECKS="no"
                    if checkOrbitcpp
                    then
                        return
                    fi
                fi
                if test "x${USE_ORBACUS}" = "xyes"
                then
                    AI_CONTINUE_ORB_CHECKS="no"
                    if checkOrbacus
                    then
                        return
                    fi
                fi
                if test "x${USE_VISIBROKER}" = "xyes"
                then
                    AI_CONTINUE_ORB_CHECKS="no"
                    if checkVisibroker
                    then
                        return
                    fi
                fi
            fi
        
            dnl Try developer's preferences (AI_CHECK_ORB parameter).
            if test "x${AI_CONTINUE_ORB_CHECKS}" = "xyes"
            then
                for orb in "${1}"
                do
                    case "x${orb}" in
                        xomniORB|xomniorb)
                            AI_CONTINUE_ORB_CHECKS="no"
                            if test "x${USE_OMNIORB}" != "xno"
                            then
                                if checkOmniorb
                                then
                                    return
                                fi
                            fi
                            ;;
                    
                        xMICO|xmico)
                            AI_CONTINUE_ORB_CHECKS="no"
                            if test "x${USE_MICO}" != "xno"
                            then
                                if checkMico
                                then
                                    return
                                fi
                            fi
                            ;;

                        xTAO|xtao)
                            AI_CONTINUE_ORB_CHECKS="no"
                            if test "x${USE_TAO}" != "xno"
                            then
                                if checkTao
                                then
                                    return
                                fi
                            fi
                            ;;

                        xorbitcpp)
                            AI_CONTINUE_ORB_CHECKS="no"
                            if test "x${USE_ORBITCPP}" != "xno"
                            then
                                if checkOrbitcpp
                                then
                                    return
                                fi
                            fi
                            ;;

                        xORBacus|xorbacus)
                            AI_CONTINUE_ORB_CHECKS="no"
                            if test "x${USE_ORBACUS}" != "xno"
                            then
                                if checkOrbacus
                                then
                                    return
                                fi
                            fi
                            ;;
                            
                        xVisiBroker|xvisibroker)
                            AI_CONTINUE_ORB_CHECKS="no"
                            if test "x${USE_VISIBROKER}" != "xno"
                            then
                                if checkVisibroker
                                then
                                    return
                                fi
                            fi
                            ;;
                    esac
                done
            fi
    
            dnl Try the default preferences.
            if test "x${AI_CONTINUE_ORB_CHECKS}" = "xyes"
            then
                AI_CONTINUE_ORB_CHECKS="no"
                if test "x${USE_OMNIORB}" != "xno"
                then
                    if checkOmniorb
                    then
                        return
                    fi
                fi
                if test "x${USE_MICO}" != "xno"
                then
                    if checkMico
                    then
                        return
                    fi
                fi
                if test "x${USE_TAO}" != "xno"
                then
                    if checkTao
                    then
                        return
                    fi
                fi
                if test "x${USE_ORBITCPP}" != "xno"
                then
                    if checkOrbitcpp
                    then
                        return
                    fi
                fi
                if test "x${USE_ORBACUS}" != "xno"
                then
                    if checkOrbacus
                    then
                        return
                    fi
                fi
                if test "x${USE_VISIBROKER}" != "xno"
                then
                    if checkVisibroker
                    then
                        return
                    fi
                fi
            fi
            
            ORB="no"
            AC_MSG_NOTICE([ORB not found])
        }
        
        findOrb "$1"
    ])