/usr/lib/x86_64-linux-gnu/pkgconfig/libelf++.pc is in libelfin-dev 0.3-1.
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 | libdir=/usr/lib/x86_64-linux-gnu
includedir=/usr/include/libelfin
Name: libelf++
Description: C++11 ELF library
Version: 0.3-1
Libs: -L${libdir} -lelf++
Cflags: -I${includedir}
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