It seems that the unicode support in dev-lang/R is not enabled. Is there a possibility to add a use flag to enable utf8 support. The documentation of R says: "For many of these features R needs to be configured with --enable-utf8". Reproducible: Always
I don't see any --enable-utf-8 in R configure or configure.ac or any of the autotools. Also R seems to support unicode on my installation, and I suspect it is enabled forced.
OK. We solved the problem. It was on our side, a conversion error. Sorry.