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To build CRE, you first need to build the server and install it (make install
if running under Linux).
CRE sources are part of the server sources.
You need Qt5 and the associated development package.
Depending on your system, installing qt5-default
may be enough.
Once the server has been built and installed, from the server sources root:
cd utils/cre && qmake && make
This should build the tool, to run it:
utils/cre/cre
should do the trick.