ENDIF            Terminate conditional block                        Directive

  IFxxx conditional
  statements
  [ELSE | ELSEIFxxx
  statements]
  ENDIF

    Terminates a conditional block initiated by IF, IF1, IF2, IFB, IFDEF,
    IFDIF, IFDIFI, IFE, IFIDN, IFIDNI, IFNB, or IFNDEF.