/usr/lib/x86_64-linux-gnu/pkgconfig/libcap.pc is in libcap-dev 1:2.25-1.2.
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=
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: libcap
Description: libcap
Version: 2.25
Libs: -L${libdir} -lcap
Libs.private:
Cflags: -I${includedir}
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