/usr/lib/x86_64-linux-gnu/pkgconfig/gutenprintui2.pc is in libgutenprintui2-dev 5.2.13-2.
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 10 11 12 | prefix=/usr
exec_prefix=${prefix}
libdir=/usr/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: Gutenprint UI (GTK+-2.0 version)
Description: Gutenprint Top Quality Printer Drivers - GTK+-2.0 User Interface
Requires: gutenprint gtk+-2.0
Version: 5.2.13
Libs: -L${libdir} -lgutenprintui2
Libs.private: -lm
Cflags: -I${includedir}
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