[Development] Updating community Qt4 port for OS/2 to Qt5

[Paul Smedley]

Hi All,

You may or may not be aware, that OS/2 has a Qt port that is currently 
at v4.7.3 (http://trac.netlabs.org/qt4)

This project has stagnated for time, but I need at least Qt 4.8.x for 
Wireshark 2.4.0 - so I've started looking at updating.

I have Qt 4.8.x building, with a few nits still to resolve.

I next want to look at building Qt 5.x.  I see that the way the OS 
specific GUI code is handled has changed significantly, instead of files 
like:
src\gui\kernel\*win.cpp

We now have all the OS specific files in (for eg)
qtbase\src\plugins\platforms\windows\*.cpp

Are there any tips on porting a platform from Qt 4.x to 5.x?

Is it likely that much of the GUI code can be re-used (albeit the file 
structure is different)?

Thanks in advance,

Paul