hello.rb

#include <stdio.h>

//; def int(*args); end
//; def main(*args, &block);
//; Object.class_eval { define_method("foo", &block) }; foo; end
//; def argc; end
//; def char; 3; end
//; def argv; 3; end

int main(int argc, char ** argv) {
  printf("Hello world!\n");
  return 0;
}

@Mon-Ouie what's this about?