Link error of static version due to multiple zlib libraries in project

Build on windows has failed due to multiple zlib instances in project

link /NOLOGO /DYNAMICBASE /NXCOMPAT /DEBUG /SUBSYSTEM:WINDOWS "/MANIFEST DEPENDENCY:type='win32' name='Microsoft.Windows.Common-Controls' version='6.0.0.0' publicKeyToken='6595b64144ccf1df' language='' processorArchitecture=''" /MANIFEST MANIFESTFILE:debug\embeddedsvgviewer.exe.embed.manifest /OUT:debug\embed
dedsvgviewer.exe @C:\Users\Anatolix\AppData\Local\Temp\nmE945.tmp
QtCored.lib(zutil.obj) : error LNK2005: _z_errmsg already defined in QtSvgd.lib(zutil.obj)
debug\embeddedsvgviewer.exe : fatal error LNK1169: one or more multiply defined symbols found
NMAKE : fatal error U1077: 'C:\bin\devel\vs2012\VC\BIN\link.EXE' : return code ' 0x491'
Stop.

BTW: why do you have 4 zlib instances in Qt5?
see:
qt3d\3rdparty\assimp\contrib\zlib\zutil.c
qtbase\src\3rdparty\freetype\src\gzip\zutil.c
qtbase\src\3rdparty\zlib\zutil.c
qtsvg\src\3rdparty\zlib\zutil.c