Trying to build the unmodified light_switch_client_nrf52832_xxAA_s132_6_0_0.emProject from a fresh download of the Mesh SDK.
SDK_ROOT set & successfully tested as instructed.
app_error.c compile fails because it can't find nrf_log.h
so I added $(SDK_ROOT:../../../../nRF5_SDK_15.0.0_a53641a)/components/libraries/experimental_log to the Include Path
app_error.c compile then fails because it can't find nrf_log_internal.h
so I added $(SDK_ROOT:../../../../nRF5_SDK_15.0.0_a53641a)/components/libraries/experimental_log/src to the Include Path
Then it all builds OK.
So why was this missing from the Project??