/usr/lib/x86_64-linux-gnu/pkgconfig/corosync.pc is in libcorosync-common-dev 2.4.2-3+deb9u1.
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=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: corosync
Version: 2.4.2
Description: corosync
Requires: libqb
Cflags: -I${includedir}
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