/usr/lib/x86_64-linux-gnu/pkgconfig/capstone.pc is in libcapstone-dev 3.0.4-5.
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 | Name: capstone
Description: Capstone disassembly engine
Version: 3.0.4
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/capstone
archive=${libdir}/libcapstone.a
Libs: -L${libdir} -lcapstone
Cflags: -I${includedir}
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