The steps i have done from hrev51428 i'm running at the moment:
1) Uninstall via haikudepot all qt4/qt5 and related programs (qupzilla, lyx ...)
2) i disabled the usual repository for haikuports via haikudepot: packages.haiku-os.org......
3) i add the new repository for testing purposes:
4) i do a "full-sync" with pkgman, what installed, uninstalled and updated many many packages and i was at hrev51620.
After a "shutdown -r" i first want to start web+, but it came up with an error, i don't remember.
Then i tried via haikudepot to install "qupzilla" without success: error about non deliver of lib5webkit_x86 > 5.5.1
Last try was with the "otter browser" again with no success: error of missing libcrypto or similar.
I then thought maybe a problem with haikudepot and want to try with the command line via pkgman.
But there was even a problem with the bash terminal: error of missing symbols or so.
At that point i unfortunately had to give up because of insufficient knowledge. Maybe i missed a step or some step was not correct or some packages are really missing.
Thanks in advance.