/usr/share/pkgconfig/xf86vidmodeproto.pc is in x11proto-xf86vidmode-dev 2.3.1-2.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: XF86VidModeProto
Description: XF86VidMode extension headers
Version: 2.3.1
Cflags: -I${includedir}
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