Re: Ubuntu 16.04 cannot compile commit c4687d920db081f29e93cca8156793d545a827e2

[Paul Eggert]

On 1/23/20 12:09 PM, Uwe Brauer wrote:
> So png12 is missing, why did compile me tell about it?

I guess your pkg-config claimed that you have a working libpng, even though you 
don't. Try running the following shell commands:

pkg-config --cflags "libpng >= 1.0.0"
pkg-config --libs "libpng >= 1.0.0"

If these commands tell 'configure' to use flags like -lpng12 but those flags 
don't work, then you have a problem with your pkg-config installation somewhere.

Although you can work around the problem by building Emacs with './configure 
--without-png', it's better to get your png installation whipped into shape.