libkolab not building

[Thomas Spuhler]

I still have problems to build libkolab
I am getting this error:

[ 13%] Building CXX object 
CMakeFiles/kolab.dir/conversion/kabcconversion.cpp.o
/home/spuhler/MageiaSVN/kolab-3.5/libkolab/BUILD/libkolab-1.0.1/conversion/kabcconversion.cpp: 
In function 'Kolab::Contact Kolab::Conversion::fromKABC(const 
KContacts::Addressee&)':
/home/spuhler/MageiaSVN/kolab-3.5/libkolab/BUILD/libkolab-1.0.1/conversion/kabcconversion.cpp:667:26: 
error: 'class KContacts::ResourceLocatorUrl' has no member named 'isEmpty'
     if (!addressee.url().isEmpty()) {

Any suggestions
I have
rpm-4.13.0-0.rc1
kde: KF5

-- 
Best regards
Thomas Spuhler

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