Liang Jing, from UCSD, got the code to make under Mac OS X. He also generated a graph that demonstrates that the excellent performance gain can be expected on PowerPC processors, too. Taken verbatim from his site http://kingler.net/:
By embedding a random grayscale pattern in a larger image, I was able to benchmark the performance on an Apple PowerMac G5 (Dual 2.5GHz PowerPC CPUs).
The template stays the same (100×100 pixels), while the size of search image is increasing (from 200×200 to 800×800, indicated by the X-axis). The Y-axis shows the cpu time. Clearly, there is a speedup of 15x - 20x, using the compiled MEX-file over the built-in normxcorr2?!