On Wed, Jul 18, 2018 at 01:04:59PM +0000, coypu%sdf.org@localhost wrote: > Debian installs libpng.so. > https://packages.debian.org/stretch/amd64/libpng-dev/filelist For variety, ubuntu 16: $ more /usr/lib/x86_64-linux-gnu/pkgconfig/libpng.pc prefix=/usr exec_prefix=${prefix} libdir=${prefix}/lib/x86_64-linux-gnu includedir=${prefix}/include/libpng12 Name: libpng Description: Loads and saves PNG files Version: 1.2.54 Libs: -L${libdir} -lpng12 Libs.private: -lz -lm Cflags: -I${includedir}