Cairo "Could not find libpng in the pkg-config search path"

Question

I'm trying to install GTK-DFB and cairo is a requirement. When I try to build it from source, it throws:

checking for cairo's PNG functions feature... 
configure: WARNING: Could not find libpng in the pkg-config search path
checking whether cairo's PNG functions feature could be enabled... no
configure: error: recommended PNG functions feature could not be enabled

Ideas?

Thanks

Answer 1

For me it helped to export the following variable in the shell:

export png_REQUIRES="libpng"

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