/usr/lib/gcc/x86_64-linux-gnu/ is in gcj-4.8-jdk 4.8.4-2ubuntu1~14.04.4.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/gcc/x86_64-linux-gnu/4.8/
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/gcj/
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/gcj/libgcj-config.h
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/jawt.h
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/jawt_md.h
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/jni.h
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/jni_md.h
/usr/lib/gcc/x86_64-linux-gnu/4.8/include/jvmpi.h
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcj-tools.so
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcj.so
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcj.spec
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgcj_bc.so
/usr/lib/gcc/x86_64-linux-gnu/4.8/libgij.so