Error when trying to enable GUI

[rambo at id.uw.edu.pl (Marcin 'Rambo' Roguski)]

On Sun, 20 Jun 2010 20:48:04 +0200
Lars Ingemar Lundin <gnt877m at tninet.se> wrote:

> When running ./configure --enable-gui I get this message: Error: The
> GUI requires libavcodec with PNG support (needs zlib). I have zlib
> version 1.2.3-140.2.

And libpng headers?

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