[Proj] Dutch coordinate system

[Paul van der Linden]

Hi all,
I'm having trouble with coordinate conversion from and to wgs84.
I have tried the various ways which I found here, but none of them seem to work.

The cs2cs example does not work with me (get an projection initialization 
failure
cause: unknown projection id
program abnormally terminated

with this parameters:
+proj=sterea +lat_0=52.15616055555555 +lon_0=5.38763888888889 +k=0.9999079 
+x_0=155000 +y_0=463000 +ellps=bessel +towgs84=565.040,49.910,465.840,-
0.40939,0.35971,-1.86849,4.0772 +units=m +no_defs)

proj gives similar messages.

I also tried 
  Projwgs:=TCoordinateTranslator.Create('..\nad');
  Projwgs.Open('+proj=latlong +ellps=WGS84');
  Projrd:=TCoordinateTranslator.Create('..\nad');
  Projrd.Open('+init=epsg:28992');
  x := 5.5*DEG_TO_RAD;
  y := 51.5*DEG_TO_RAD;
  res := _pj_transform(ProjWgs.Pjj,projrd.pjj, 1,0, at x, at y, at z);
but I keep getting 
wgs:5.5,51.5 rd:162801,390015

while the correct result should be rd: 162832,390115, according to pctrans,fme, 
software based on rdnap.

Can you clarify this for me?

Thanx