Can not build 4.7 from git with -arch x86

Configuring with -arhc x86 and building Qt 4.7.1 on Mac OSX 10.6.4 gives the following errors:

(tested with:
./configure -debug-and-release -commercial -arch x86 -nomake examples -nomake demos -cocoa -no-qt3support -largefile -no-mmx -no-3dnow -no-sse -no-sse2 -no-webkit -no-phonon -no-script -no-scripttools -qt-sql-sqlite -no-reduce-exports )

image/qimage_ssse3.cpp: In function 'void qt_convert_rgb888_to_rgb32_ssse3(quint32*, const uchar*, int)':
image/qimage_ssse3.cpp:68: error: '__m128i' does not name a type
image/qimage_ssse3.cpp:71: error: '__m128i' does not name a type
image/qimage_ssse3.cpp:74: error: '__m128i' does not name a type
image/qimage_ssse3.cpp:76: error: '__m128i' was not declared in this scope
image/qimage_ssse3.cpp:76: error: 'inVectorPtr' was not declared in this scope
image/qimage_ssse3.cpp:76: error: expected primary-expression before ')' token
image/qimage_ssse3.cpp:76: error: expected `;' before 'src'
image/qimage_ssse3.cpp:77: error: 'dstVectorPtr' was not declared in this scope
image/qimage_ssse3.cpp:77: error: expected primary-expression before ')' token
image/qimage_ssse3.cpp:77: error: expected `;' before 'dst'
image/qimage_ssse3.cpp:91: error: expected `;' before 'firstSrcVector'
image/qimage_ssse3.cpp:92: error: expected `;' before 'outputVector'
image/qimage_ssse3.cpp:93: error: 'outputVector' was not declared in this scope
image/qimage_ssse3.cpp:93: error: 'alphaMask' was not declared in this scope
image/qimage_ssse3.cpp:93: error: '_mm_or_si128' was not declared in this scope
image/qimage_ssse3.cpp:93: error: '_mm_store_si128' was not declared in this scope
image/qimage_ssse3.cpp:99: error: expected `;' before 'secondSrcVector'
image/qimage_ssse3.cpp:100: error: expected `;' before 'srcVector'
image/qimage_ssse3.cpp:101: error: 'srcVector' was not declared in this scope
image/qimage_ssse3.cpp:101: error: 'shuffleMask' was not declared in this scope
image/qimage_ssse3.cpp:101: error: '_mm_shuffle_epi8' was not declared in this scope
image/qimage_ssse3.cpp:105: error: 'firstSrcVector' was not declared in this scope
image/qimage_ssse3.cpp:105: error: 'secondSrcVector' was not declared in this scope
image/qimage_ssse3.cpp:108: error: '_mm_lddqu_si128' was not declared in this scope
image/qimage_ssse3.cpp:109: error: '_mm_alignr_epi8' was not declared in this scope
image/qimage_ssse3.cpp:117: error: 'shuffleMaskEnd' was not declared in this scope
make[2]: *** [.obj/debug-shared/qimage_ssse3.o] Error 1