gcc reduction.m -o redux -framework Foundation -framework MacRuby -fobjc-gc

reduction.m

#import <MacRuby/MacRuby.h>

int main(void) {
  NSString *test = @"test";
  [[MacRuby sharedRuntime] evaluateString:@"def value=(val); @val = val; end; def value; @val; end"];
  [[MacRuby sharedRuntime] performRubySelector:sel_registerName("value=:") withArguments:test, nil];
  id result = [[MacRuby sharedRuntime] evaluateString:@"value"];
  NSLog(@"%@\n", result);
  return 0;
}