**OECORE_CMAKE_TOOLCHAINS*: a list of installed toolchains (for example *core2_64 armv7a_neon armv5te*)
**OECORE_CMAKE_arch_TOOLCHAIN*: where *arch* is from the previous list (for example *OECORE_CMAKE_CORE2_64_TOOLCHAIN*). Location of the *toolchain.cmake* file for a specific architecture
**OECORE_HOST_SYSROOT*: used by ground control station to retrieve maps provider plugins (for gps)
**OECORE_HOST_NATIVE_SYSROOT*: used to retrieve host's cmake and doxygen tools.
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**OECORE_HOST_arch_NATIVE_SYSROOT*: used to retrieve cmake and doxygen tools for a specific toolchain.
