Bug#878705: opencv: FTBFS on x32: sysctl(.h) unsupported

[Mattia Rizzolo]

On Mon, Oct 16, 2017 at 10:41:56AM -0400, Aaron M. Ucko wrote:
> Thanks for the quick response!  I can't readily test a fix[1], but
> suspect the problem is the second half of
> 
> >     #elif defined __APPLE__ || !defined __GNU__

oh, right...

> which results in trying to #include <sys/sysctl.h> on a wide range of
> architectures.  (Only the Hurd predefines __GNU__.)  Seeing as cmake
> detects that <sys/sysctl.h> is unusable on x32, I'd suggest merging and
> simplifying the second and third branches to something along the lines of

Actually, I wonder why we need that !defined __GNU__ at all.  It's added
by the patch used to support !linux archs, but nonetheless, sysctl() is
only used in code sourranded by '#if defined __APPLE__' anyway.

I'm trying a patch now.

-- 
regards,
                        Mattia Rizzolo

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