Milter-greylist

On Sat, Feb 20, 2010 at 09:24:42AM +0100, manu@... wrote:
> Johann E. Klasek <johann@...> wrote:
> 
> > > Is it a right move to remove the test on (__RES >= 19991006)? That one
> > > should be much more reliable than attempting to link a program.
> > 
> > As mentioned before this condition was only a quick hack to
> > cope with environments, where res_n* functions are not based
> > on macros.
> 
> Is it? I thought it was to test for res_n* availability.

My answer was maybe too short: Sure, in case res_ninit is not a macro
the simplyfied asumption from __RES >= 19991006 is, that we have at
least a Bind resolver library and this version seem new enough (Bind 8
...) and that we can hope a threaded version is also available. This
seems to hold at least on Solaris but just for res_ninit(). It does not
help much if we want to know if res_ndestroy exists (Solaris 9 has
res_ndestroy, Solaris 8 has't, but both have the same __RES value ...).

So IMHO it is mandatory to use autoconf for optimal portability.

Johann E. K.