/usr/lib/x86_64-linux-gnu/pkgconfig/libfl.pc is in libfl-dev 2.6.4-6.
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 | prefix=
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
Name: libfl
Description: Flex (the fast lexical analyzer) support library
Version: 2.6.4
Libs: -L${libdir} -lfl
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