The `Config.in` files should be indented using tab characters instead of eight spaces, as specified by the buildroot documentation [here](http://buildroot.uclibc.org/downloads/manual/manual.html#writing-rules-config-in):
> - The `bool`, `depends on`, `select` and `help` lines are indented with one tab.
> - The help text itself should be indented with one tab and two spaces.