/usr/lib/x86_64-linux-gnu/pkgconfig/jack.pc is in libjack-jackd2-dev 1.9.12~dfsg-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 | prefix=/usr
exec_prefix=/usr
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
server_libs=-L/usr/lib/x86_64-linux-gnu -ljackserver
Name: jack
Description: the Jack Audio Connection Kit: a low-latency synchronous callback-based media server
Version: 1.9.12
Libs: -L/usr/lib/x86_64-linux-gnu -ljack
Cflags: -I/usr/include
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