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1) Yes, if there is any failure in CMake, you will fail while compiling.

Do not ignore any error or even warning in CMake by keep pressing "configure".

Fix the error or warning in CMake configure log.

When you selecting "with XXX",  make sure you have XXX on your computer or it will be build by OpenCV.

2) Put more information about the failure in CMake or compiling, so people can give you more specific suggestion.

3) You can install Qt5 before configuring OpenCV 2.4.6 . Then in CMake, selecting "with Qt".

Use "Grouped" and "Advanced" well to check if there is any failure about finding Qt.

1) Yes, if there is any failure in CMake, you will fail while compiling.

Do not ignore any error or even warning in CMake by keep pressing "configure".
"configure".  
Fix the error or warning in CMake configure log.
log.  
When you selecting "with XXX",  make sure you have XXX on your computer or it will be build by OpenCV.

2) Put more information about the failure in CMake or compiling, so people can give you more specific suggestion.

3) You can install Qt5 before configuring OpenCV 2.4.6 . Then in CMake, selecting "with Qt".

Use "Grouped" and "Advanced" well to check if there is any failure about finding Qt.