1if(NOT trout_PROTOBUF_ROOT_DIR) 2 set(trout_PROTOBUF_ROOT_DIR ${CMAKE_CURRENT_SOURCE_DIR}/third_party/protobuf) 3endif() 4 5if(EXISTS "${trout_PROTOBUF_ROOT_DIR}/cmake/CMakeLists.txt") 6 set(_trout_PROTOBUF_WELLKNOWN_INCLUDE_DIR "${trout_PROTOBUF_ROOT_DIR}/src") 7else() 8 message(FATAL_ERROR "${trout_PROTOBUF_ROOT_DIR}/cmake/CMakeLists.txt not found") 9endif() 10 11