/usr/lib/x86_64-linux-gnu/pkgconfig/zlib.pc is in zlib1g-dev 1:1.2.7.dfsg-13.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
sharedlibdir=${libdir}
includedir=${prefix}/include
Name: zlib
Description: zlib compression library
Version: 1.2.7
Requires:
Libs: -L${libdir} -L${sharedlibdir} -lz
Cflags: -I${includedir}
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