Re: png module on max os x

Dear John,

thanks for your answer. I fiddled a bit around and found that I had a 
weird mixture of 32bit and 64bit installs on my computer. This resulted 
in a 32bit ISIS trying to load a 64bit libpng. I cleared that up and now 
everything works fine.

Cheers,
  Felix

On Fri Nov 30 08:18:56 2012, John Houck wrote:
> On Thu, Nov 29, 2012 at 09:37 -0800, Felix Fuerst wrote:
>> Dear isis-users,
>>
>> I would love to use the png module of s-lang in ISIS, but there
>> seems to be a problem with the libpng library. I receive the
>> following error:
>>
>> isis> require("png") ;
>> Error linking to
>> /Users/fuerst/bin/slang/lib/slang/v2/modules/png-module.so:
>> dlopen(/Users/fuerst/bin/slang/lib/slang/v2/modules/png-module.so,
>> 10): Symbol not found: _png_create_info_struct
>>    Referenced from:
>> /Users/fuerst/bin/slang/lib/slang/v2/modules/png-module.so
>>    Expected in: flat namespace
>>   in /Users/fuerst/bin/slang/lib/slang/v2/modules/png-module.so
>> 0
>>
>> This is on a MacBook Pro running Mac OS X 10.7.5. Probably this is
>> has to do with a 32bit vs 64bit incompatibility, but I did not find
>> a clear solution on the web. I was hoping someone on this list might
>> know a solution and can save me some time playing around and
>> re-compiling everything several times?
>
> It looks like a problem with the installation of slang or
> libpng.  I don't think it's an isis problem.
>
> In particular, my guess is that it's a path searching problem.
> At run-time, the symbol _png_create_info_struct must be
> resolved by loading the contents of the shared library
> libpng.so or libpng.dylib or something like that.
>
> Because png-module.so exists on your system, libpng was
> presumably found on your system at compile time, so I assume
> that it still exists on your system.
>
> The problem now might be that the run-time loader cannot find
> libpng.
>
> To help the loader find it, you can probably set the
> DYLD_LIBRARY_PATH environment variable.  For example, if libpng
> is in /opt/lib, then doing:
>
>     setenv DYLD_LIBRARY_PATH /opt/lib
>
> might solve the problem.  Does that fix it?
>
> Thanks,
> -John


-- 
Felix Fuerst
ff_at_email.domain.hiddenNuSTAR Science Team
Caltech, Pasadena, CA
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