/usr/lib/x86_64-linux-gnu/pkgconfig/libpng12.pc is in libpng12-dev 1.2.46-3ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include/libpng12
Name: libpng
Description: Loads and saves PNG files
Version: 1.2.46
Libs: -L${libdir} -lpng12
Libs.private: -lz -lm
Cflags: -I${includedir}
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