https://blog.qt.io/blog/2015/10/15/qt-5-5-1-released/?replyt

@Maurice Kalinowski I beg to slightly disagree with your "you can easily build Qt for Visual Studio 2015 manually based on the existing documentation" comment.

It's not that building Qt is hard. Yet it's a bit of a treasure hunt:

  - the official documentation implies it's better to build ANGLE but there's no need to stress out about building it (and installing the DirectX SDK which is btw no more a separate install) -- Qt's build system will just build its own copy of ANGLE provided you installed Visual Studio 2015 with the Windows SDK.
  - the official documentation mentions you need ICU for QtWebkit -- yet it doesn't explain how to build ICU (the Qt wiki does, but ICU54 requires patching to build with VS2015; not your fault)
  - the official documentation just drops the ball when it's about building QtWebkit. Qt's wiki somehow let you believe you have to build QtWebkit separately by pointing you to QtWebkit's trac wiki (where you start stressing about which sqlite revision you're going to take) -- again, Qt's build system will just handle it provided you have Ruby, Python and Perl in your %PATH% (maybe just Ruby, I don't remember which part needs which prerequisite).
  - Qt 5.5.1 source drop shipped with <a href="https://bugreports.qt.io/browse/QTBUG-46863?focusedCommentId=294629&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-294629">a bug in assimp.pri </a> that prevents it from building out of the box -- again that's ok, resolution easy. It just shows you're no more used to build Qt from your source drops and following the instructions on the Qt's site (not the wiki).

My remarks may sound obnoxious but I believe it shows Qt is indeed easy to build for you seasoned Qt folks. But it took me several hours of Googling and asking on IRC before succeeding building Qt 5.5.1 with QtWebkit. Add to the quest the fact that the trial / error roundtrip is made abysmal by the Qt/C++ compile times.

That's why I wrote about my experience compiling 5.5.1 with QtWebkit with Visual Studio 2015. I hope it helps others build it on their own. See my comment above.