/usr/lib/x86_64-linux-gnu/pkgconfig/mircookie.pc is in libmircookie-dev 0.26.3+16.04.20170605-0ubuntu1.1.
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 | prefix=/usr
exec_prefix=/usr
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/mircookie
Name: mircookie
Description: Mir client library
Version: 0.26.3
Libs: -L${libdir} -lmircookie
Cflags: -I${includedir}
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