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C Language: nfbdef in DEC C

The Question is:

I am porting a DECNET application from VAXC to DECC on
OpenVMS alpha. I cannot find nfbdef.h or any other header
that defines the symbols and offsets for declaring a
network name. Any help is greatly appreciated.

The Answer is:

                 -< "#include " statement compiles >-

   We'll assume you understand the method by which DEC C locates the
   necessary include files, and the use of ALPHA$LIBRARY:, and the
   contents of the OpenVMS Alpha SYS$LIB_C.TLB and SYS$STARLET_C.TLB
   C definition libraries.

   Having just tried a test on a local OpenVMS Alpha V6.2 system running
   the DEC C V5.2 compiler, nfbdef.h is present and C programs that issue
   an "#include " statement compile correctly, and we are at a
   loss to explain what you are seeing.

   Are other system-provided include files being correctly accessed?
   What DEC C and OpenVMS versions are in use here?  Does this code
   compile under DEC C on OpenVMS VAX?