Debian-9.5/amd64.
But building hello.mo with i386-elf-gcc (5.5.0) cross compiler on
OpenBSD-6.3/amd64, undefined reference to 'rt_kprintf' error occurs.
To avoid this error, "compile and link" process needs to be divided to
simply "compile" and "link".
On Debian-9.5, both previous and current method produces same hello.mo.
We have to improve disk image creation (Linux dependent),
this is a future homework.
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