/usr/lib/x86_64-linux-gnu/pkgconfig/cairo-png.pc is in libcairo2-dev 1.15.10-2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: cairo-png
Description: PNG functions for cairo graphics library
Version: 1.15.10
Requires: cairo libpng
Libs:
Cflags: -I${includedir}/cairo
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