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Sorry, could not help

Sorry, could not help

I've tried to install Qt+mingw package (Qt 5.8.0-mingw), it installed, but no make(.exe) in this package.
MSYS/mingw setup looks made for someone who is already 'in context' and know what to do to install it.

Your error messages looks like no libraw library is linked. This may be because you've specified wrong library or library path:
g++ simple_dcraw.cpp -o simple.exe -Ilibraw -Llib -lraw
I assume you're already in samples folder, so right path is -L../lib, not -Llib

To use .pro files you may need to edit .pro files to specify (or disable) jpeg library and rawspeed library

-- Alex Tutubalin