GLFW 0.3 build fails w/ SSE error in 6.10.3, works in 6.10.1

Using GHC 6.10.3 to build GLFW 0.3 dies with:

/usr/lib/gcc/i686-apple-darwin9/4.0.1/include/xmmintrin.h:35:3:
    error: #error "SSE instruction set not enabled"

on Mac OSX 10.5.6 (intel)

By downgrading to 6.10.1 the build works. I saw some IRC chat logs where others had this problem with 6.10.2.