Compiling on Tru64 with Compaq cxx 6.5

Hi!

I'm trying to compile the C++ part of netcdf 3.6.0-p1 on an Alpha Workstation 
running Tru64 V5.1B.
I want to compile using the native Compaq compiler (Version 6.5, apparently) 
and ghet the following error during the C++ part:

make[2]: Entering directory `/usr/orgis/build/netcdf-3.6.0-p1/src/cxx'
cxx -c -O2 -std ansi -D__USE_STD_IOSTREAM -I/usr/orgis/Tru64/include -I../libsrc
cxx: Warning: ncvalues.h, line 35: integer conversion resulted in a change of
          sign
static const ncbyte ncBad_byte = NC_FILL_BYTE;
---------------------------------^
cxx: Error: ../libsrc/nc.h, line 41: expected an identifier
        NC_UNSPECIFIED = 0,
--------^
cxx: Info: 1 error detected in the compilation of "netcdf.cpp".


Is this just a problem with a too old version of Compaq C++ ?  The code? Do I 
need some special compiler flags (apart from -std ansi, perhaps)?

Greets,

Thomas.

-- 
Thomas Orgis - theoretischer Physiker, praktischer Mensch
Arbeitsgruppe Nichtlineare Dynamik,
Universitaet Potsdam