https://bugzilla.redhat.com/show_bug.cgi?id=1048493



--- Comment #13 from Denis Fateyev <de...@fateyev.com> ---
Glenn Randers-Pehrson (the current 'libpng' maintainer) answered:

> Note that it's a one-line change to mozilla's configure.in to allow a non-apng
> supporting libpng to work.  At line 3154 in today's Nightly, change
> AC_MSG_ERROR to AC_MSG_RESULT and you'll get the warning "--with-system-png
> won't work because the system's libpng doesn't have APNG" but configure will
> continue and build a non-APNG-supporting Firefox.

> If icecat's image/decoders/nsPNGDecoder.cpp is up-to-date with current 
> mozilla-central it should work OK.  If not, there was one place I had to add
> "#ifdef PNG_APNG_SUPPORTED" within the past couple of months.

After that we can get rid of bundled libpng, at least. As for others
(libtheora, libvorbis, libogg, libopus), I haven't checked yet.

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