[Cin] libdpx c++ check

[Phyllis Smith]

That is a better solution so I will wait to see what you come up with.  The
first patch, which had problems, would cause problems for many more people
and we really, really want as many people to be able to build themselves
without having to add new requirements that might not even work for older
systems like ubuntu 16.

also, while watching paint dry.. err, watching cin compile on emulated
> powerpc I noticed we already override cxx standard for fileexr (look for
> c++11 in cinelerra/Makefile) so hopefully same can be done for filedpx
>
>
>
> On Tuesday, April 5, 2022, Andrew Randrianasulu <randrianasulu at gmail.com>
> wrote:
>
>> ow.
>>
>> does autoreconf fixes this?
>>
>>
>> https://stackoverflow.com/questions/27673292/ax-cxx-compile-stdcxx-11-macro-not-found
>>
>> autoreconf --install --force
>>
>> if not - look for aditional autoconf-archive package? (not sure about
>> fedora's packaging)
>>
>> On Tuesday, April 5, 2022, Phyllis Smith <phylsmith2017 at gmail.com> wrote:
>>
>>> When applied, this patch immediately stops the build on Fedora 32 with
>>> the following error:
>>> checking whether we are using the GNU C++ compiler... yes
>>> checking whether g++ accepts -g... yes
>>> checking dependency style of g++... none
>>> ./configure: line 4828: syntax error near unexpected token `11,'
>>> ./configure: line 4828: `AX_CXX_COMPILE_STDCXX(11, noext, optional)'
>>> make: *** No targets specified and no makefile found.  Stop.
>>> mv: cannot stat 'Makefile': No such file or directory
>>>
>>> On Tue, Apr 5, 2022 at 2:14 AM Andrew Randrianasulu via Cin <
>>> cin at lists.cinelerra-gg.org> wrote:
>>>
>>>> also add pkg-config based check for libva's location
>>>>
>>>> alsoI think my patches for aborting compile if withzmpeg = no and
>>>> v4l2/dvb = yes need  || test case for xauto...
>>>>
>>>> ---------- Forwarded message ----------
>>>> From: *Андрей Рандрианасулу* <randrik at mail.ru>
>>>> Date: Tuesday, April 5, 2022
>>>> Subject: libdpx c++ check
>>>> To: randrianasulu <randrianasulu at gmail.com>
>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Андрей  Рандрианасулу
>>>>
>>>> --
>>>> Cin mailing list
>>>> Cin at lists.cinelerra-gg.org
>>>> https://lists.cinelerra-gg.org/mailman/listinfo/cin
>>>>
>>>
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