hello.c

#include <stdio.h>

int main(int argc, const char * argv[]) {

  printf("mesage!\n");
  return 0;
}

Rakefile

CC = "gcc"

task :default => "hello"

file "hello" => "hello.o" do
  sh "#{CC} -o hello hello.o"
end

file "hello.o" => "hello.c" do
  sh "#{CC} -c hello.c"
end