On big-endian ppc64 qt fails to build:

image/qimage_conversions.cpp:2257:9: error: expected ‘}’ before numeric constant
0, 0, 0, 0
^
image/qimage_conversions.cpp:2257:9: error: expected ‘}’ before numeric constant
image/qimage_conversions.cpp:2257:9: error: expected ‘,’ or ‘;’ before numeric constant
image/qimage_conversions.cpp:2258:5: error: expected declaration before ‘}’ token
}, // Format_RGBA8888

That happens because two commas are missing in
./qtbase/src/gui/image/qimage_conversions.cpp

2250 #if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
2251 0,
2252 convert_ARGB_to_ARGB_PM,
2253 #else
2254 0,
2255 0
2256 #endif
2257 0, 0, 0, 0
2258 }, // Format_RGBA8888
2259
2260

{ 2261 0, 2262 0, 2263 0, 2264 0, 2265 convert_RGBA_PM_to_RGB, 2266 convert_RGBA_PM_to_ARGB, 2267 convert_RGBA_to_ARGB, 2268 0, 2269 0, 2270 0, 2271 0, 2272 0, 2273 0, 2274 0, 2275 0, 2276 0, 2277 #if Q_BYTE_ORDER == Q_LITTLE_ENDIAN 2278 convert_ARGB_PM_to_RGB, 2279 convert_ARGB_PM_to_ARGB, 2280 0, 2281 #else 2282 0, 2283 0, 2284 0 2285 #endif 2286 0, 0, 0, 0 2287 }

, // Format_RGBA8888_Premultiplied
2288

As you can see there are two missing commas after the zeros above the #endifs.