/usr/lib/x86_64-linux-gnu/pkgconfig/fann.pc is in libfann-dev 2.1.0~beta+dfsg-1.
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
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: fann
Description: Fast Artificial Neural Network Library
Version: 2.1.0
Libs: -L${libdir} -lm -lfann
Cflags: -I${includedir}
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