portability - values.h

This question is probably better suited for comp.lang.c, but
it pertains to some GRASS code that I'm writing.
I'm going to use a singular value decomposition and I need
the smallest representable double value. Under SunOS 4.1
and 5.1, I can get this from values.h (MINDOUBLE).
Is this portable?

--Darrell

On my Apollo Domain machine is values.h a sys5.3 feature. I am using
bsd4.3 and then it wouldn't be portable for me. I think it must be
the same on other HP machines. I remember that I had trouble before with
this include file.

Lars

Lars Schylberg Email: larss@fmi.kth.se
Dept. of Geodesy and Photogrammetry
Royal Institute of Technology (KTH) Tel. +46 8 790 86 33
S-100 44 STOCKHOLM, SWEDEN Fax. +46 8 790 66 10