+set(BUILD_TESTS off CACHE BOOL "Build test suite" FORCE)
+set(WITH_LUA off CACHE BOOL "Build with lua support" FORCE)
+
+if (NOT EXISTS "${CMAKE_SOURCE_DIR}/osm2pgsql/CMakeLists.txt")
+ message(FATAL_ERROR "The osm2pgsql directory is empty.\
+ Did you forget to check out Nominatim recursively?\
+ \nTry updating submodules with: git submodule update --init")
+endif()