> > > After testing some more cases:
> > >=20
> > > Now it works with explicitly using --enable-localpng or=20
> > > --disable-localpng, but not with the default (none of them).
> > >=20
> > > The "else" case seems not to be executed when the option is=20
> > defaulted.
> >=20
> >=20
> > Yes, That is what I find too - if I explicitly set the enable/disable
> > option for PNG I can get either the system or the built-in=20
> > PNG lib, but
> > if I leave it to default, it *finds* the system PNG lib, but does not
> > use it...
>
> Hmm, I don't think I understand the change that's been made.
> It seems like the test for "AC_CHECK_LIB(png,png_set_tRNS_to_alpha" has
> been moved inside the test for "AC_ARG_ENABLE(localpng," when it used to
> be done separately, after it? I'm not sure.
>
There must be a bracketing pb, I'll check that asap, but we're on the good 
path, these changes are worth the work.
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