/usr/lib/x86_64-linux-gnu/pkgconfig/atk-bridge-2.0.pc is in libatk-bridge2.0-dev 2.10.2-2ubuntu1.
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=${prefix}
libdir=${prefix}/lib/x86_64-linux-gnu
includedir=${prefix}/include
Name: atk-bridge-2.0
Description: ATK/D-Bus Bridge
Version: 2.10.2
Requires.Private: gobject-2.0 atspi-2
Libs: -L${libdir} -latk-bridge-2.0
Cflags: -I${includedir}/at-spi2-atk/2.0
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