>>> "SM" == Stefan Monnier <monnier@iro.umontreal.ca> writes:

   >> pkg_cv_LIBOTF_LIBS='-lfreetype -lz -lpng12 -lotf -lfreetype'
   > [...]
   >> LIBOTF_LIBS='-lfreetype -lz -lpng12 -lotf -lfreetype'

   > I think this is part of the answer: why do the OTF settings ask for
   > a `png12` library?

Ok I could finally do some testing. 

I tried again to ./configure and compile master from December 2019 and
from August 2019 which I have compiled without a problem.

And it is the same problem, although now png16 is installed configure,
sets the flag to png12.

I presume before my upgrade, I had png12.

I am not sure how to deal with it. 

    1. I don't want to run --without-png

    2. I don't want to desinstall png16 (which would be effectively the
       same, at least for emacs compiling)


Any ideas?

Uwe Brauer