/usr/lib/gcc/hppa64-linux-gnu/5/include/ is in gcc-5-hppa64-linux-gnu 5.3.1-14ubuntu2.
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/usr/lib/gcc/hppa64-linux-gnu/5/include-fixed/README
/usr/lib/gcc/hppa64-linux-gnu/5/include-fixed/limits.h
/usr/lib/gcc/hppa64-linux-gnu/5/include-fixed/syslimits.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/float.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/iso646.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdalign.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdarg.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdatomic.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdbool.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stddef.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdfix.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdint-gcc.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdint.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/stdnoreturn.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/unwind.h
/usr/lib/gcc/hppa64-linux-gnu/5/include/varargs.h