Problems in building Sonic Pi from source on Ubuntu 20.04

I have tried to build Sonic Pi on Ubuntu 20.04 but at the last step the process fails in building Sonic Pi. This is the error I get in the terminal window:
verbgio@verbgio-S500CA:~/Development/sonic-pi/app/gui/qt/build$ cmake --build . --config Release
[ 0%] Automatic MOC for target QScintilla
[ 0%] Built target QScintilla_autogen
[ 98%] Built target QScintilla
[ 99%] Automatic MOC for target sonic-pi
[ 99%] Built target sonic-pi_autogen
[ 99%] Linking CXX executable sonic-pi
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/9/…/…/…/x86_64-linux-gnu/Scrt1.o: in function _start': (.text+0x24): undefined reference to main’
collect2: error: ld returned 1 exit status
make[2]: *** [CMakeFiles/sonic-pi.dir/build.make:93: sonic-pi] Errore 1
make[1]: *** [CMakeFiles/Makefile2:99: CMakeFiles/sonic-pi.dir/all] Errore 2
make: *** [Makefile:84: all] Errore 2