bug#30431: 27.0.50; "Work even if libpng is install in /usr/local" causes build failure

[Paul Eggert]

On 02/12/2018 01:31 PM, Werner LEMBERG wrote:
> > > -   if test $HAVE_PNG = no; then
> > > +   if test $HAVE_PNG = yes; then
> > > +    LIBPNG="$PNG_LIBS"
> > > +   else
> > Thanks, Glenn. Werner, does that work for you?
> It works just fine, thanks!
>
>
>      Werner

Thanks for checking. I installed the attached patch, which attempts to 
implement Glenn's suggestion.

0001-Work-if-libpng-is-in-usr-local-2nd-try.patch
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