/usr/lib/pkgconfig/libqrencode.pc is in libqrencode-dev 3.1.1-1ubuntu1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libqrencode
Description: A QR Code encoding library
Version: 3.1.1
Libs: -L${libdir} -lqrencode
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