/usr/lib/pkgconfig/gimpui-2.0.pc is in libgimp2.0-dev 2.8.22-1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib
includedir=${prefix}/include
Name: GIMP UI
Description: GIMP User Interface Library
Version: 2.8.22
Requires: gimp-2.0 >= 2.8 gtk+-2.0 >= 2.24.10
Libs: -L${libdir} -lgimpui-2.0 -lgimpwidgets-2.0 -lgimpmodule-2.0
Cflags: -I${includedir}/gimp-2.0
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