[yocto] how to install files in nativesdk

[Steve Scott]

Hi:

I'm a list newbie, so let me know if this should be posted somewhere else.

I am able to generate a standard SDK with native and target
sysroots. The target sysroot has header files for my custom
libraries. The header files are generally installed in
<path-to-sdk-target-sysroot>/usr/include/  

We use cmake and googletest running on the *host* for testing some of
our libraries. So I need to build googletest and the test apps using the
host (x86_64) tools. The test apps need to include the target's library
header files.

I tried specifying the SDK's *target* usr/include as an include directory to
the compiler, but files in this tree preempted the standard compiler (g++)
system include files. I can avoid this problem by installing the library
header files under the SDK's native sysroot; i.e. in 
<path-to-sdk-native-sysroot>/usr/include/ 
and setting this directory as an include directory on the compiler
command line.

However, I cannot grok how to get these files into the SDK's native
tree. It seems related to  
   BBCLASSEXTEND = "native nativesdk"
but I'm just chasing my tail trying to figure out the magic incantation.

Does anyone know how to do this? Or is there a better approach?

Thanks.

-steve scott