Compile error: module machine type 'X86' conflicts with target machine type 'x64'

perl init-repository --codereview-username rlohning --berlin

D:\dev\src\qt-5.9.0-pre\configure.bat -developer-build -opensource -confirm-license -nomake examples -nomake tests -opengl desktop -skip speech

C:/Python27/python.exe ../../../../../../../../../../../src/qt-5.9.0-pre/qtwebengine/src/3rdparty/chromium/build/toolchain/win/tool_wrapper.py link-wrapper environment.x64 False link.exe /nologo /OUT:./gn.exe /PDB:./gn.exe.pdb @./gn.exe.rsp
LINK : warning LNK4075: /INCREMENTAL wird aufgrund der Angabe von /OPT:ICF ignoriert.
obj/tools/gn/gn/gn_main.obj : fatal error LNK1112: Modul-Computertyp "X86" steht in Konflikt mit dem Zielcomputertyp "x64".
ninja: build stopped: subcommand failed.
Building gn manually in a temporary directory for bootstrapping...
Building gn using itself to out\Release...
Command '['D:/dev/32/MSVC2015/qt-5.9.0-pre-desktop-nospeech/qtwebengine/src/3rdparty/ninja/ninja.exe', '-C', 'D:\\dev\\32\\MSVC2015\\qt-5.9.0-pre-desktop-nospeech\\qtwebengine\\src\\3rdparty\\chromium\\tools\\gn\\out\\Release', 'gn']' returned non-zero exit status 1
Project ERROR: GN build error!
jom: D:\dev\32\MSVC2015\qt-5.9.0-pre-desktop-nospeech\qtwebengine\src\buildtools\Makefile [sub-gn-pro-make_first] Error 3
jom: D:\dev\32\MSVC2015\qt-5.9.0-pre-desktop-nospeech\qtwebengine\src\Makefile [sub-buildtools-make_first] Error 2
jom: D:\dev\32\MSVC2015\qt-5.9.0-pre-desktop-nospeech\qtwebengine\Makefile [sub-src-make_first] Error 2
jom: D:\dev\32\MSVC2015\qt-5.9.0-pre-desktop-nospeech\Makefile [module-qtwebengine-make_first] Error 2