/usr/lib/x86_64-linux-gnu/pkgconfig/libsvn_diff.pc is in libsvn-dev 1.9.7-4ubuntu1.
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: libsvn_diff
Description: Subversion Diff Library
Version: 1.9.7
Requires: apr-1
Requires.private: libsvn_subr
Libs: -L${libdir} -lsvn_diff -lz
Cflags: -I${includedir}
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