/usr/lib/x86_64-linux-gnu/pkgconfig/libsigrok.pc is in libsigrok-dev 0.3.0-1build1.
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 12 13 14 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libsigrok
Description: Backend library of the sigrok logic analyzer software
URL: http://www.sigrok.org
Requires: glib-2.0
Requires.private: libzip libserialport libusb-1.0 libftdi
Version: 0.3.0
Libs: -L${libdir} -lsigrok
Libs.private: -lm
Cflags: -I${includedir}
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