In Ubuntu 18.04 gcc is upgraded to v7.3
this (in combination with us using a 2014 commit of oigtl) is probably why this happens:
.../mitk-superbuild/ep/src/OpenIGTLink/Source/igtlNDArrayMessage.h: In member function ‘int igtl::Array<T>::SetValue(igtl::ArrayBase::IndexType, T)’: .../mitk-superbuild/ep/src/OpenIGTLink/Source/igtlNDArrayMessage.h:94:62: error: ‘void*’ is not a pointer-to-object type * (T *) this->m_ByteArray[Get1DIndex(index) * sizeof(T)] = value;