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No Make file found

I need to install opencv extra modules.. so I followed the steps given :

I did: C:\Users\research lab>cd C:\opencv3.1\build

C:\opencv3.1\build> cmake -DOPENCV_EXTRA_MODULES_PATH=C:\opencv_ex\opencv_contrib-master\modules C:\opencv3.1\sources

I got:-- Configuring done -- Generating done -- Build files have been written to: C:/opencv3.1/build

but when i run : make-j5 i got an error : no targets specified and no makefile found..

I checked my build folder, no MAKEFILE was there . WHY is it happening? does makefile is not being generated or some other issue is there?????