Hi Jerome,

  Parsec doesn't depend on optee-client and doesn't require it at all. If Parsec is built with the Trusted Services provider included  then `libts` is added into DEPENDS and RDEPENDS:

https://git.yoctoproject.org/meta-security/tree/meta-parsec/recipes-parsec/parsec-service/parsec-service_1.0.0.bb#n23

The libts recipe (it will be merged into meta-arm later today or tomorrow together with other generic recipes for Trusted Services Secure Partitions (SWd side) and test/demo tools (NWd side)) creates `teeclnt` group.

Cheers,
Anton