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Date:	Tue, 10 Feb 2015 16:23:25 -0500
From:	Ken Brown <kbrown AT cornell DOT edu>
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To:	cygwin AT cygwin DOT com
Subject:	Re: Emacs and last libpng release
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On 2/10/2015 1:13 PM, Yaakov Selkowitz wrote:
> On Tue, 2015-02-10 at 12:44 -0500, Ken Brown wrote:
>> On 2/10/2015 11:55 AM, Angelo Graziosi wrote:
>>> Ken Brown wrote:
>>>> I think the better way is for all libraries that rely on libpng15 to rebuild
>>>> for libpng16.
>>>
>>> Does this mean that there is some library which, after being rebuilt, will allow
>>> Emacs to be build OB, linking to libpng16, without the need to install libpng15?
>>
>> I think that's right.  It looks to me like ImageMagick and fontconfig are both
>> adding -lpng15 to the link command line.  I'm puzzled about fontconfig because
>> it was just rebuilt.
>>
>> $ pkg-config --libs fontconfig
>> -lfontconfig -lexpat -lfreetype -lbz2 -lz -lpng15 -lm -lz -lexpat -lfreetype
>> -lbz2 -lz -lpng16 -lm -lz
>>
>> Yaakov, can you explain this?
>
> cygcheck -c libfontconfig-devel libfreetype-devel ?

Sorry, you lost me.  I don't see anything in libfreetype-devel that 
explains why the output of 'pkg-config --libs fontconfig' should contain 
'-lpng15'.  freetype2 itself doesn't have this problem:

$ pkg-config --libs freetype2
-lfreetype -lbz2 -lz -lpng16 -lm -lz

Ken

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