/home/pi/skysource$  sudo apt-get install qt5-default
Reading package lists...
Building dependency tree...
Reading state information...
qt5-default is already the newest version.
The following package was automatically installed and is no longer required:
  libllvm3.7
Use 'apt-get autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 238 not upgraded.