/usr/lib/x86_64-linux-gnu/pkgconfig/frame-x11.pc is in libframe-dev 2.5.0daily13.06.05-0ubuntu1.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: frame-x11
Description: Touch Frame Library - X11 support
Version: 2.5.0
Requires: frame = 2.5.0
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