/usr/lib/x86_64-linux-gnu/pkgconfig/gl.pc is in libgl1-mesa-dev 11.2.0-1ubuntu2.
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=${prefix}/include
Name: gl
Description: Mesa OpenGL library
Requires.private: libdrm >= 2.4.60 x11 xext xdamage xfixes x11-xcb xcb xcb-glx >= 1.8.1 xcb-dri2 >= 1.8 xxf86vm
Version: 11.2.0
Libs: -L${libdir} -lGL
Libs.private: -lm -lpthread -ldl
Cflags: -I${includedir}
glx_tls: yes
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