/usr/lib/x86_64-linux-gnu/pkgconfig/glw.pc is in libglw1-mesa-dev 8.0.0-1.1.
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 13 | prefix=/usr
exec_prefix=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: glw
Description: Mesa OpenGL widget library
Requires: gl
Requires.private: x11 xt
Version: 8.0.0
Libs: -L${libdir} -lGLw
Libs.private: -lXm
Cflags: -I${includedir}
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