/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/ is in gcc-6-plugin-dev-hppa-linux-gnu 6.3.0-18cross1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/dbxelf.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/elfos.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/glibc-stdint.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/gnu-user.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/initfini-array.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/linux-protos.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/linux.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/pa/
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/pa/pa-linux.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/pa/pa-opts.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/pa/pa-protos.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/pa/pa.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/pa/pa32-linux.h
/usr/lib/gcc-cross/hppa-linux-gnu/6/plugin/include/config/pa/pa32-regs.h