Hi!
I have compile the gui program by QT5.9 (sudo apt install qt5-default).
The compiling complete finely at lxqt and debian9:

sudo apt install qt5-default
cd program_directory
make clean
make

*At lxqt, the binary program runs finely*. But lxqt take up too much space, 
so I need in debian9.
But at debian9, running the binary file returns an error:
*QXcbConnection: Could not connect to display*

I have made:
*export DISPLAY=:0.0*
*sudo apt install libffi-dev phantomjs gksu xserver-xorg*

But the error is still present.

Also I can run the gui program at debian9 from another PC by:
ssh -X 192.168.X.X -l debian
but this doesn't solve the problem.

P.S.
I was advised here, and then my topic was deleted:


*You are going to have to add enough stuff to provide, at minimum, an 
Xserver implementation -- and most likely you'll need a 
window/desktopmanager.*
*The xserver is installed.*

Please help.

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