/usr/lib/x86_64-linux-gnu/pkgconfig/egl.pc is in libegl1-mesa-dev 8.0.4-0ubuntu0.6.
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 12 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include
Name: egl
Description: Mesa EGL library
Requires.private: glproto >= 1.4.14 libdrm >= 2.4.24 dri2proto >= 2.6 x11 xext xdamage xfixes x11-xcb xcb-glx xxf86vm
Version: 8.0.4
Libs: -L${libdir} -lEGL
Libs.private: -lm -lpthread -ldl
Cflags: -I${includedir}
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