Build Failed

Hi,

I try to build Musecore from the github source and the build process fail with

git clone https://github.com/musescore/MuseScore.git
cd MuseScore
make release

ends with
Makefile:49: the rule for target „release“ failed
make: *** [release] Error 2

There are syntax errors (what I can't really believe). Maye I use the wrong compiler?

I have attached the whole build output.
My guess, that I have missed something very simple.

Best Regards
Zabooh