/usr/lib/pkgconfig/libotr.pc is in libotr2-dev 3.2.0-4.
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=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include
Name: libotr
Description: Off-the-Record Messaging Library
Version: 3.1.0
URL: http://otr.cypherpunks.ca/
Libs: -L${libdir} -lotr
Cflags: -I${includedir}
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