/usr/lib/x86_64-linux-gnu/pkgconfig/libproxy-1.0.pc is in libproxy-dev 0.4.11-0ubuntu4.
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
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libproxy-1.0
Description: Proxy Configuration Library
Version: 0.4.11
Libs: -L${libdir} -lproxy
Libs.private: -lpthread -lm
Cflags: -I${includedir}
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