/usr/lib/x86_64-linux-gnu/pkgconfig/libfreefare.pc is in libfreefare-dev 0.4.0-2.
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 12 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: libfreefare
Description: MIFARE contactless tag access library
Version: 0.4.0
URL: http://code.google.com/p/nfc-tools
Requires: libnfc
Libs: -L${libdir} -lfreefare
Cflags: -I${includedir}
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