Hi, I am trying to compile abinit-6.6.3 using gcc45 installed using macports. I am on Mac OS X Lion. I am getting the following error message: /var/folders/bl/8wb0ry9x00g8k6v3l9z293r80000gp/T//ccmJW8V4.s:94:no such instruction: `vmovsd LC2(%rip), %xmm5' And it goes on for many lines, with different instructions. Would anyone happen to know what is causing this error? I have also posted this on the abinit forum, but haven't had a response in over 2 weeks... Thanks, Anna.