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Espresso
Espresso is a simple operating system built with C and i686(IA32) assembler.
== BUILDING ==
First, you need a cross-compiler and toolchain built, see https://wiki.osdev.org/GCC_Cross-Compiler
for instructions.
then, `cd` into the directory with the code (you should see the `kernel`, `include`, and `lib` directories if you're in the right place.) and type `make build`. this will also run the OS. type `make clean` after every change to rebuild everything.