/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/ is in gcc-arm-none-eabi 15:4.9.3+svn231177-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/aarch-common-protos.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/aout.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/arm-cores.def
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/arm-opts.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/arm-protos.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/arm.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/bpabi.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/elf.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/arm/unknown-elf.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/dbxelf.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/elfos.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/initfini-array.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/newlib-stdint.h
/usr/lib/gcc/arm-none-eabi/4.9.3/plugin/include/config/vxworks-dummy.h