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/usr/lib/x86_64-linux-gnu/pkgconfig/libpng12.pc is in libpng12-dev 1.2.54-1ubuntu1.1.

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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}