Error on compiling source from git in Ubuntu 20.04

[marcobra]

hi,

on:    Ubuntu 20.04.3 LTS with just pulled git core source

latest changelog:
2021-04-28 20:02 UTC+0200 Aleksander Czajczynski (hb fki.pl)

at

make

....
....

hbmk2[gtwvg]: Exit status: 50: richiesta di stop
/home/ubuntu/core/bin/linux/gcc/hbmk2 -quiet -width=0 -autohbm- @hbpre -inc gtqtc/gtqtc.hbp @hbpost
In file included from /usr/include/x86_64-linux-gnu/qt5/QtGui/qevent.h:50,
                 from /usr/include/x86_64-linux-gnu/qt5/QtGui/QKeyEvent:1,
                 from ../../../../../contrib/gtqtc/gtqtc.h:64,
                 from ../../../../../contrib/gtqtc/gtqtc1.cpp:49:
/usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h: In constructor ‘QVariant::QVariant(QVariant&&)’:
/usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h:275:25: warning: implicitly-declared ‘QVariant::Private& QVariant::Private::operator=(const QVariant::Private&)’ is deprecated [-Wdeprecated-copy]
  275 |     { other.d = Private(); }
      |                         ^
/usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h:401:16: note: because ‘QVariant::Private’ has user-provided ‘QVariant::Private::Private(const QVariant::Private&)’
  401 |         inline Private(const Private &other) Q_DECL_NOTHROW
      |                ^~~~~~~
In file included from /usr/include/x86_64-linux-gnu/qt5/QtGui/qevent.h:50,
                 from /usr/include/x86_64-linux-gnu/qt5/QtGui/QKeyEvent:1,
                 from ../../../../../lib/linux/gcc/.hbmk/gtqtc/../../../../../contrib/gtqtc/gtqtc.h:64,
                 from ../../../../../lib/linux/gcc/.hbmk/gtqtc/moc_gtqtc.cpp:9:
/usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h: In constructor ‘QVariant::QVariant(QVariant&&)’:
/usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h:275:25: warning: implicitly-declared ‘QVariant::Private& QVariant::Private::operator=(const QVariant::Private&)’ is deprecated [-Wdeprecated-copy]
  275 |     { other.d = Private(); }
      |                         ^
/usr/include/x86_64-linux-gnu/qt5/QtCore/qvariant.h:401:16: note: because ‘QVariant::Private’ has user-provided ‘QVariant::Private::Private(const QVariant::Private&)’
  401 |         inline Private(const Private &other) Q_DECL_NOTHROW
      |                ^~~~~~~
/home/ubuntu/core/bin/linux/gcc/hbmk2 -quiet -width=0 -autohbm- @hbpre -inc gtalleg/gtalleg.hbp @hbpost
! Finished package build...
./bin/linux/gcc/hbmk2 ./config/postinst.hb first
! postinst script finished

Thanks