/usr/lib/pkgconfig/liblbfgs.pc is in liblbfgs-dev 1.10-6.
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 9 10 11 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib
includedir=${prefix}/include
Name: liblbfgs
Description: L-BFGS nonlinear optimizer
Version: 1.10
URL: http://www.chokkan.org/software/liblbfgs/index.html
Libs: -L${libdir} -llbfgs
Cflags: -I${includedir}
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