message: Fix output dir checks
diff: @@ -159,14 +159,14 @@ endif()
  # set module path appropriately
  set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
  # set binary output path if not defined by user
  -if(EXECUTABLE_OUTPUT_PATH STREQUAL "")
  +if(NOT EXECUTABLE_OUTPUT_PATH)
  set(EXECUTABLE_OUTPUT_PATH "${CMAKE_CURRENT_BINARY_DIR}/bin")
  endif()
  # set library output path if not defined by user, but always set
  # library output path to binary output path for Xcode projects
  if(CMAKE_GENERATOR STREQUAL "Xcode")
  set(LIBRARY_OUTPUT_PATH "${EXECUTABLE_OUTPUT_PATH}")
  -elseif(LIBRARY_OUTPUT_PATH STREQUAL "")
  +elseif(NOT LIBRARY_OUTPUT_PATH)
  set(LIBRARY_OUTPUT_PATH "${CMAKE_CURRENT_BINARY_DIR}/lib")
  endif()
  