/usr/lib/x86_64-linux-gnu/pkgconfig/libgcj14.pc is in libgcj14-dev 4.8.4-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/pkgconfig/libgcj-4.8.pc
/usr/lib/x86_64-linux-gnu/pkgconfig/libgcj-4.8.pc