Building Qt from Source: Pathfinding broken: Uic.exe misses Qt5Core.dll

While doing an in-place or shadow-build compilation, at some point Uic.exe gets called and it cant find Qt5Core.dll. Even if it is there. Copying Qt5Core.dll to the *\qtbase\bin Folder "fixes" it. But later, other Tools cant find the other *.dlls in the *\qtbase\lib Folder.

Compilation is broken since the December 16 Snapshot. Also the Source from Git (Files from December 18) are broken. The Last Snapshot that was working for me was from December 10. But I dont have that Snapshot lying around anymore.

I will try if adding the empty shadow-build Path will work as a workaround for now.
Building under Linux (Antergos, KDE 5.5.1 / Plasma 5, 64-bit) works fine. Mac OS untested (I dont have a Mac).

Some config Files from the current shadow-build Test has been added.

The last Error in the VS2015 CMD Shell is:

jom: C:\xsdf64\qtbase\Makefile [sub-src-make_first] Error 2
jom: C:\xsdf64\Makefile [module-qtbase-make_first] Error 2

The Config Parameter are:

c:\qt5src\configure -opensource -confirm-license -prefix c:\qt-build-64bit-icu -opengl dynamic -debug-and-release -developer-build -openssl -I C:\opensslx64\include -L C:\opensslx64\lib -icu -I C:\icurlsx64\include -L C:\icurlsx64\lib -mp -nomake tests -nomake examples -no-warnings-are-errors

BTW: Qt 5.5.1 does get compiled just fine.