This is the source code of Linux 0.0.1, the first version of Linux.
Linus forgot this version and this is his friend's.
Now, (2020) Linux source code has million lines. Linux 0.0.1 is Simpler than it.
There was a Makefile. You must install GCC-ARM on your Computer (because Linux use ARM Assembly, not AT&T).
Then, type make (or mingw32-make) to terminal, Compiler is starting. It'll create a Image File and write data to it likes disk.
Finally, burn the Image File to your disk (or other media), and then restart your Computer. Linux 0.0.1 will start.