Problems compiling musescore 2.0 beta1 on Debian testing

Hello all!

Please help me with compiling on Debian.

The error in my build log is:
[ 5%] Generating ui_fluid_gui.h
Could not create output file
fluid/CMakeFiles/fluid.dir/build.make:58: recipe for target 'fluid/ui_fluid_gui.h' failed
make[3]: *** [fluid/ui_fluid_gui.h] Error 1
make[3]: Leaving directory '/home/apkolosov/work/opensource/MuseScore-2.0beta1/build.release'
CMakeFiles/Makefile2:592: recipe for target 'fluid/CMakeFiles/fluid.dir/all' failed
make[2]: *** [fluid/CMakeFiles/fluid.dir/all] Error 2
make[2]: Leaving directory '/home/apkolosov/work/opensource/MuseScore-2.0beta1/build.release'
Makefile:133: recipe for target 'all' failed
make[1]: *** [all] Error 2
make[1]: Leaving directory '/home/apkolosov/work/opensource/MuseScore-2.0beta1/build.release'
Makefile:34: recipe for target 'release' failed
make: *** [release] Error 2

Additional questions:
1) At the begginning of the build process there is bunch of errors like:
CMake Warning at build/FindQt5Transitional.cmake:29 (find_package):
By not providing "FindQt5Designer.cmake" in CMAKE_MODULE_PATH this project
has asked CMake to find a package configuration file provided by
"Qt5Designer", but CMake did not find one.

Does this warning means that my build environment is wrong or something?

2) I've found additional error messages in the build log:
CMakeFiles/lrelease.dir/build.make:49: recipe for target 'CMakeFiles/lrelease' failed
make[4]: *** [CMakeFiles/lrelease] Error 127
make[4]: Leaving directory '/home/apkolosov/work/opensource/MuseScore-2.0beta1/build.release'
CMakeFiles/Makefile2:91: recipe for target 'CMakeFiles/lrelease.dir/all' failed
make[3]: *** [CMakeFiles/lrelease.dir/all] Error 2
make[3]: Leaving directory '/home/apkolosov/work/opensource/MuseScore-2.0beta1/build.release'
CMakeFiles/Makefile2:99: recipe for target 'CMakeFiles/lrelease.dir/rule' failed
make[2]: *** [CMakeFiles/lrelease.dir/rule] Error 2
make[2]: Leaving directory '/home/apkolosov/work/opensource/MuseScore-2.0beta1/build.release'
Makefile:180: recipe for target 'lrelease' failed
make[1]: *** [lrelease] Error 2

But the build process continues. Is this correct?