[Mapserver-users] httpd-error.log: Incompatible libpng version

[thelen at ccgis.de]

Thanks Norman, thanks Daniel!!

Both ways are working properly. I understand Daniels way, because gdal
comes with its own copy of libpng (--with-png=internal). But I do not
understand Normans way to build mapserver without png! Thats just the
configure skript without the "--with-png=/usr/local"! It is working
properly, too!

Is it something like, "Oh, I (mapserver) don't know what to do with png,
let's see if gdal knows. If gdal knows, mapserver is just happy? That's an
explanation attempt for non-technicians :-)!

Thanks again! Really great!


Benjamin

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> thelen at ccgis.de wrote:
>>
>> gd (I use 2.0.15) does not carry its own internal copy of png.h, but
>> gdal
>> does:
>> /usr/ports/graphics/gdal/work/gdal-1.1.8/frmts/png/libpng/png.h
>>
>> And you are right! This is: libpng version 1.0.6 - March 21, 2000
>>
>> So, it is a gdal (and/or a FreeBSD Ports) problem! Isn't "application"
>> then in this case gdal??
>>
>>
>> What can I do then?
>
> You need to force GDAL to use the system version of libpng. GDAL has the
> following configure option:
>
>    --with-png[=ARG]        Include PNG support (ARG=internal, no or path)
>
>
> So you should add "--with-png=/usr/local" to your GDAL configure options
> and rebuild.
>
>
>> And why does this error not occur with MapServer 3.6.6?
>>
>
> Probably just a coincidence related to the order in which symbols are
> loaded. You definitely have two copies of libpng loaded in memory at
> once in both cases (i.e. in 3.6 and inb 4.0), but in one case the
> problem happens and in the other you're lucky enough that the program
> always uses the right symbols and doesn't produce the error.
>
> Daniel
> --
> ------------------------------------------------------------
>   Daniel Morissette               morissette at dmsolutions.ca
>   DM Solutions Group              http://www.dmsolutions.ca/
> ------------------------------------------------------------
>
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