[yocto] Any hints when building boost-nativesdk?

[Chatre, Reinette]

Hi,

I am running Yocto 1.2 and would like to include the boost development
environment in my SDK. I created a bbappend for the boost recipe that
only contains two lines:

PR = "${INC_PR}.1"
BBCLASSEXTEND += "nativesdk"

When I build with the above I get the following warnings:
NOTE: multiple providers are available for runtime boost-date-time (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-date-time
NOTE: multiple providers are available for runtime boost-filesystem (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-filesystem
NOTE: multiple providers are available for runtime boost-graph (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-graph
NOTE: multiple providers are available for runtime boost-iostreams (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-iostreams
NOTE: multiple providers are available for runtime boost-program-options (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-program-options
NOTE: multiple providers are available for runtime boost-regex (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-regex
NOTE: multiple providers are available for runtime boost-signals (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-signals
NOTE: multiple providers are available for runtime boost-system (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-system
NOTE: multiple providers are available for runtime boost-test (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-test
NOTE: multiple providers are available for runtime boost-thread (boost, boost-nativesdk)
NOTE: consider defining a PREFERRED_PROVIDER entry to match boost-thread

It seems a bit strange that "boost-nativesdk" is seen as a provider for
any of those runtime components. Any hints what I should change to build
things correctly?

Thank you very much

Reinette