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$     IF (P4.EQS."GNUC")
$     THEN
$!
$!      Looks Like GNUC, Set To Use GNUC.
$!
$       COMPILER = "GNUC"
$!
$!      Tell The User We Are Using GNUC.
$!
$       WRITE SYS$OUTPUT "Using GNU 'C' Compiler."
$!
$!    End The GNU C Check.
$!
$     ENDIF
$!
$!  Else The User Entered An Invalid Arguement.
$!
$   ELSE
$!
$!    Tell The User We Don't Know What They Want.
$!
$     WRITE SYS$OUTPUT ""
$     WRITE SYS$OUTPUT "The Option ",P4," Is Invalid.  The Valid Options Are:"
$     WRITE SYS$OUTPUT ""
$     WRITE SYS$OUTPUT "    VAXC  :  To Compile With VAX C."
$     WRITE SYS$OUTPUT "    DECC  :  To Compile With DEC C."
$     WRITE SYS$OUTPUT "    GNUC  :  To Compile With GNU C."
$     WRITE SYS$OUTPUT ""
$!
$!    Time To EXIT.
$!
$     EXIT
$!
$!  End The Valid Arguement Check.
$!
$   ENDIF
$!
$! End The P4 Check.
$!
$ ENDIF
$!
$! Time to check the contents of P5, and to make sure we get the correct library.
$!
$ IF P5.EQS."SOCKETSHR" .OR. P5.EQS."MULTINET" .OR. P5.EQS."UCX" -
     .OR. P5.EQS."TCPIP" .OR. P5.EQS."NONE"
$ THEN
$!
$!  Check to see if SOCKETSHR was chosen
$!
$   IF P5.EQS."SOCKETSHR"
$   THEN
$!
$!    Set the library to use SOCKETSHR
$!
$     TCPIP_LIB = "SYS$DISK:[-.VMS]SOCKETSHR_SHR.OPT/OPT"
$!
$!    Tell the user
$!
$     WRITE SYS$OUTPUT "Using SOCKETSHR for TCP/IP"
$!
$!    Done with SOCKETSHR
$!
$   ENDIF
$!
$!  Check to see if MULTINET was chosen
$!
$   IF P5.EQS."MULTINET"
$   THEN
$!
$!    Set the library to use UCX emulation.
$!
$     P5 = "UCX"
$!
$!    Tell the user
$!
$     WRITE SYS$OUTPUT "Using MultiNet via UCX emulation for TCP/IP"
$!
$!    Done with MULTINET
$!
$   ENDIF
$!
$!  Check to see if UCX was chosen
$!
$   IF P5.EQS."UCX"
$   THEN
$!
$!    Set the library to use UCX.
$!
$     TCPIP_LIB = "SYS$DISK:[-.VMS]UCX_SHR_DECC.OPT/OPT"
$!
$!    Tell the user
$!
$     WRITE SYS$OUTPUT "Using UCX or an emulation thereof for TCP/IP"
$!
$!    Done with UCX
$!
$   ENDIF
$!
$!  Check to see if TCPIP was chosen
$!
$   IF P5.EQS."TCPIP"
$   THEN
$!
$!    Set the library to use TCPIP (post UCX).
$!
$     TCPIP_LIB = "SYS$DISK:[-.VMS]TCPIP_SHR_DECC.OPT/OPT"
$!
$!    Tell the user
$!
$     WRITE SYS$OUTPUT "Using TCPIP (post UCX) for TCP/IP"
$!
$!    Done with TCPIP
$!
$   ENDIF
$!
$!  Check to see if NONE was chosen
$!
$   IF P5.EQS."NONE"
$   THEN
$!
$!    Do not use a TCPIP library.
$!
$     TCPIP_LIB = ""
$!
$!    Tell the user
$!
$     WRITE SYS$OUTPUT "A specific TCPIP library will not be used."
$!
$!    Done with NONE.
$!
$   ENDIF
$!
$!  Set the TCPIP_TYPE symbol
$!
$   TCPIP_TYPE = P5
$!
$!  Print info
$!
$   WRITE SYS$OUTPUT "TCP/IP library spec: ", TCPIP_LIB
$!
$!  Else The User Entered An Invalid Arguement.
$!
$ ELSE
$   IF P5 .NES. ""
$   THEN
$!
$!    Tell The User We Don't Know What They Want.
$!
$     WRITE SYS$OUTPUT ""
$     WRITE SYS$OUTPUT "The Option ",P5," Is Invalid.  The Valid Options Are:"
$     WRITE SYS$OUTPUT ""
$     WRITE SYS$OUTPUT "    SOCKETSHR  :  To link with SOCKETSHR TCP/IP library."
$     WRITE SYS$OUTPUT "    UCX        :  To link with UCX TCP/IP library."
$     WRITE SYS$OUTPUT "    TCPIP      :  To link with TCPIP TCP/IP (post UCX) library."
$     WRITE SYS$OUTPUT "    NONE       :  To not link with a specific TCP/IP library."
$     WRITE SYS$OUTPUT ""
$!
$!    Time To EXIT.
$!
$     EXIT
$   ELSE
$!
$! If TCPIP is not defined, then hardcode it to make
$! it clear that no TCPIP is desired.
$!
$     IF P5 .EQS. ""
$     THEN
$       TCPIP_LIB = ""
$       TCPIP_TYPE = "NONE"
$     ELSE
$!
$!    Set the TCPIP_TYPE symbol
$!
$       TCPIP_TYPE = P5
$     ENDIF
$   ENDIF
$!
$!  Done with TCP/IP libraries
$!
$ ENDIF
$!
$! Special Threads For OpenVMS v7.1 Or Later
$!
$! Written By:  Richard Levitte
$!              richard@levitte.org
$!
$!
$! Check To See If We Have A Option For P6.
$!
$ IF (P6.EQS."")
$ THEN
$!
$!  Get The Version Of VMS We Are Using.
$!
$   ISSEVEN :=
$   TMP = F$ELEMENT(0,"-",F$EXTRACT(1,4,F$GETSYI("VERSION")))
$   TMP = F$INTEGER(F$ELEMENT(0,".",TMP)+F$ELEMENT(1,".",TMP))
$!
$!  Check To See If The VMS Version Is v7.1 Or Later.
$!
$   IF (TMP.GE.71)
$   THEN
$!
$!    We Have OpenVMS v7.1 Or Later, So Use The Special Threads.
$!
$     ISSEVEN := ,PTHREAD_USE_D4
$!
$!  End The VMS Version Check.
$!
$   ENDIF
$!
$! End The P6 Check.
$!
$ ENDIF
$!
$!  Time To RETURN...
$!
$ RETURN