WP8548 GPS - Sample code for navigation

Hi,
I am unable to use the sample code for navigation (in the legato.io positioning control API document) . while trying to build the code I am getting Error like “The required Environment value, AR7_TOOLCHAIN_DIR, has not been set”. It will be helpful if someone can share a document on how to use GPS of WP8548.

Thanks

Did you try running the following before make, as per the getting started guide (http://mangoh.io/getting-started.html)?

$ source ~/legato/packages/legato.sdk.latest/resources/configlegatoenv