/usr/lib/x86_64-linux-gnu/pkgconfig/ibus-1.0.pc is in libibus-1.0-dev 1.5.11-1ubuntu2.
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=${prefix}/include
datadir=${prefix}/share
pkgdatadir=${prefix}/share/ibus
Name: IBus
Description: IBus Library
Version: 1.5.11
Requires: gobject-2.0 gio-2.0
Libs: -L${libdir} -libus-1.0
Cflags: -I${includedir}/ibus-1.0
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