/usr/lib/x86_64-linux-gnu/pkgconfig/glfw3.pc is in libglfw3-dev 3.2.1-1.
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 | prefix=/usr
exec_prefix=${prefix}
includedir=${prefix}/include
libdir=${exec_prefix}/lib/x86_64-linux-gnu
Name: GLFW
Description: A multi-platform library for OpenGL, window and input
Version: 3.2.1
URL: http://www.glfw.org/
Libs: -L${libdir} -lglfw
Libs.private: -lrt -lm -ldl
Cflags: -I${includedir}
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