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FTBFS: ktorrent. What does this error mean?

I am trying to build ktorrent 4.3.1 for my first time. I want to fix some bugs in it. I'm using Kubuntu wily, and I got the sources from "apt-get source ktorrent".

I do not understand this error, could someone explain it to me?

[ 38%] Built target ipblocklisttest_automoc
Linking CXX executable ipblocklisttest
/usr/bin/ld: CMakeFiles/ipblocklisttest.dir/__/ipblocklist.o: undefined reference to symbol '_ZNK12QHostAddress13toIPv4AddressEv'
/usr/lib/x86_64-linux-gnu/libQtNetwork.so.4: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status
plugins/ipfilter/tests/CMakeFiles/ipblocklisttest.dir/build.make:137: recipe for target 'plugins/ipfilter/tests/ipblocklisttest' failed
make[2]: *** [plugins/ipfilter/tests/ipblocklisttest] Error 1
CMakeFiles/Makefile2:953: recipe for target 'plugins/ipfilter/tests/CMakeFiles/ipblocklisttest.dir/all' failed
make[1]: *** [plugins/ipfilter/tests/CMakeFiles/ipblocklisttest.dir/all] Error 2
Makefile:126: recipe for target 'all' failed
make: *** [all] Error 2
[ezust@cerberus] /usr/local/ktorrent-4.3.1/build>