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+xv6 is nice, but requires gcc
+
+picoc: github.com/Prashant47/picoc
+guy had the same idea of a self-hosting and self-compiling
+cc in xv6.
+
+No perl, no make, and no funny business in the C compiler.
+One issue will be the linker. Either go back to binary or
+a.out format or using ELF (juck).