/usr/lib/x86_64-linux-gnu/pkgconfig/glfw3.pc is in libglfw3-dev 3.0.4-1.
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 11 12 13 | prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib/x86_64-linux-gnu
Name: GLFW
Description: A portable library for OpenGL, window and input
Version: 3.0.4
URL: http://www.glfw.org/
Requires.private: x11 xrandr xi xxf86vm gl
Libs: -L${libdir} -lglfw
Libs.private: -lrt -lm
Cflags: -I${includedir}
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