See Bug https://bugreports.qt.io/browse/QTBUG-48237
compile of 5.5.1 rc on windows currently not possible
this is the windows commandline buildscript to reproduce:
build.bat
// Some comments here
set QTDIR=C:\Qt\5.5.1_vc120_opengl_x64
set MYQTSOURCEDIR=D:\qt-src-5.5.1
set MYQTBUILDDIR=D:\Qt-build_x64
set MYQTINSTALLDIR=C:\Qt\5.5.1_vc120_opengl_x64
set PATH=%MYQTBUILDDIR%\qtbase\bin;%MYQTSOURCEDIR%\gnuwin32\bin;%PATH%
set MYOPENSSLDIR=C:\Qt\precompiled_3rdParty\openSSL_VC120_x64
set MYLIBPQDIR=C:\Qt\precompiled_3rdParty\libpq_VC120_x64
set PATH=%PATH%;C:\Qt\precompiled_3rdParty\icu4c-55.1_vc120_x86xp_x64\bin64
set INCLUDE=%INCLUDE%C:\Qt\precompiled_3rdParty\icu4c-55.1_vc120_x86xp_x64\include;
set LIB=%LIB%C:\Qt\precompiled_3rdParty\icu4c-55.1_vc120_x86xp_x64\lib64;
cd /D %MYQTBUILDDIR%
%MYQTSOURCEDIR%/configure -confirm-license -debug-and-release -platform win32-msvc2013 -nomake tests -nomake examples -mp -opengl desktop -icu -prefix %MYQTINSTALLDIR% -openssl -I %MYOPENSSLDIR%\include -L %MYOPENSSLDIR%\lib -plugin-sql-psql -I %MYLIBPQDIR%\include -L %MYLIBPQDIR%\lib -l libpqdll
nmake