/usr/lib/x86_64-linux-gnu/pkgconfig/loadpng.pc is in libloadpng4-dev 2:4.4.2-4.
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 12 13 14 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
version=4.4.2
suffix=
Name: loadpng
Description: PNG addon for Allegro game programming library
Version: ${version}
# always statically linked
Libs: -L${libdir} -lloadpng${suffix} -lpng -lz
Requires: allegro${suffix} >= ${version}
Cflags: -I${includedir}
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