How to give wine a path to existing dll files
Solution 1:
I found out, that wine offers the WINEPATH
-variable, which adds additional paths to look out for other libraries.
WINEPATH=/opt/qt/win32/qt/5.6/mingw49_32/bin/ /opt/qt/win32/qt/Tools/mingw492_32/libexec/gcc/i686-w64-mingw32/4.9.2/cc1.exe --help
does work.