qt5 configuration tool - qt5ct

https://fixmynix.com/change-qt5-application-style-with-qt5ct/
https://sourceforge.net/projects/qt5ct/

Qt4 based application style could be changed easily by qtconfig-qt4 tool, even by editing the Trolltech.conf file, but there is no such utility to change Qt5 theme, change qt5 widget style or fonts style.

fails to compile on Stretch so far
https://forums.bunsenlabs.org/viewtopic.php?pid=48956#p48956
https://github.com/mati75/qt5ct/issues/6

compile fixed, it also needs

sudo apt install qt5-style-plugins

to get gtk theme compatibility.

edit: Kvantum alternative
https://store.kde.org/content/show.php/Kvantum?content=166241

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