Compiler error is:

duplicate symbol __ZN17double_conversion23DoubleToStringConverter19EcmaScriptConverterEv in:
/usr/local/lib/libPocoFoundation.a(NumericString.cpp.o)
/usr/local/Qt-5.5.1/lib/libQt5Core.a(double-conversion.o)

I fixed it by patching NumericString.cpp with
#define double_conversion poco_double_conversion
on line 21