Re: emacs-20111018-r106127 Windows Binaries

[Eli Zaretskii <eliz@gnu.org>]

> Date: Mon, 24 Oct 2011 11:42:32 +0200
> From: Seweryn Kokot <sewkokot@gmail.com>
> Cc: emacs-devel@gnu.org
> 
> I copied the lib14-14.dll and zlib.dll files from the last Sean's
> devel built to the new Christoph's built bin/ directory.
> 
> Sean's built:
> M-: (image-type-available-p 'png) RET
> t
> C-h v libpng-version RET
> libpng-version's value is 10403

This means Sean's binary was compiled with libpng v1.4.3

> Christoph's built:
> M-: (image-type-available-p 'png) RET
> nil
> C-h v libpng-version RET
> libpng-version's value is 10237

And this means that Christoph built his binary with libpng 1.2.37,
which is _older_ than 1.4.x.  So Christoph's binary refuses to work
with the new version of libpng you have, because versions before and
after 1.4.0 are binary incompatible.

To fix this for the binary you have, download libpng version that is
1.2.x and put the DLL in the same place where you have
libpng14-14.dll.

Christoph, to prevent such problems in the future, please build next
binaries with a newer version of libpng.  (nt/INSTALL tells you where
to find them.)