D3 NT vs LINUX locate 'ars'

It seems the 'ars' & 'drs' sequence expressions in the locate do not
work in Linux.

Given the program

DRLIST=''
DRSLIST=''
ARLIST=''
ARSLIST=''
FOR I=1 TO 20
  X=RND(20)-10
  LOCATE(X,ARLIST;ARPOS;'AR') ELSE NULL
  ARLIST=INSERT(ARLIST,ARPOS;X)
  LOCATE(X,ARSLIST;ARSPOS;'ARS') ELSE NULL
  ARSLIST=INSERT(ARSLIST,ARSPOS;X)
  LOCATE(X,DRLIST;DRPOS;'DR') ELSE NULL
  DRLIST=INSERT(DRLIST,DRPOS;X)
  LOCATE(X,DRSLIST;DRSPOS;'DRS') ELSE NULL
  DRSLIST=INSERT(DRSLIST,DRSPOS;X)
NEXT I
FOR I=1 TO 20
  CRT ARLIST<I>'R#10':ARSLIST<I>'R#10':
  CRT DRLIST<I>'R#10':DRSLIST<I>'R#10'
NEXT I

On d3 7.4.6.NT I get ...
         1       -10       -10         7
         2       -10       -10         4
         2       -10       -10         3
         2        -7        -7         3
         3        -6        -6         2
         3        -6        -6         2
         4        -6        -6         2
         7        -6        -6         1
        -2        -5        -5        -2
        -2        -4        -4        -2
        -4        -2        -2        -4
        -5        -2        -2        -5
        -6         1         7        -6
        -6         2         4        -6
        -6         2         3        -6
        -6         2         3        -6
        -7         3         2        -7
       -10         3         2       -10
       -10         4         2       -10
       -10         7         1       -10

but on 7.5.0.LINUX
         2         2        -8        -8
         2         2        -7        -7
         3         3        -7        -7
         4         4        -7        -7
         4         4        -7        -7
         5         5        -4        -4
         6         6        -1        -1
         6         6         8         8
         7         7         7         7
         7         7         7         7
         7         7         7         7
         7         7         7         7
         8         8         6         6
        -1        -1         6         6
        -4        -4         5         5
        -7        -7         4         4
        -7        -7         4         4
        -7        -7         3         3
        -7        -7         2         2
        -8        -8         2         2

Feldercarb! Now I have to split into a negative list & a postive list,
then merge them together.
Am I missing some $options thingy that might get Linux locate working
like NT?

Jeremy Thomson