/usr/lib/pkgconfig/libopenni2.pc is in libopenni2-dev 2.2.0.33+dfsg-7+deb9u1.
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 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include/openni2
Name: OpenNI2
Description: A general purpose driver for all OpenNI cameras.
Version: 2.2.0.3
Cflags: -I${includedir}
Libs: -L${libdir} -lOpenNI2
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