For now cmake-utils.eclass does not support space separated lists when passing thinks like -DLINDUAS=${LINGUAS} via mycmakeargs to cmake-utils_src_configure{in,out}. The attached patch is from igli with some debugging from me which we did together on IRC.
Created attachment 172873 [details, diff] cmake-utils.diff
Reassigning to kde herd.
Actualy i am not in fawor of this but someone else might be willing to implement this.
After a bit discusion we decided that we wont support space-separated array list.