/usr/lib/x86_64-linux-gnu/pkgconfig/nettle.pc is in nettle-dev 2.4-1ubuntu0.1.
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=${prefix}/include
Name: Nettle
Description: Nettle low-level cryptographic library (symmetric algorithms)
URL: http://www.lysator.liu.se/~nisse/nettle
Version: 2.4
Libs: -L${libdir} -lnettle
Cflags: -I${includedir}
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