CMake with Xcode: configured header file (.h.in) not found

I am working on a CMake Tutorial and I do this before the section "Adding a Version Number and a Custom Header File". Unfortunately, Xcode does not recognize the generated header file:

Error:

The header file was generated by CMake ok:

TutorialConfig.h.in

// the configured options and settings for Tutorial

#define Tutorial_VERSION_MAJOR @Tutorial_VERSION_MAJOR@
#define Tutorial_VERSION_MINOR @Tutorial_VERSION_MINOR@

CMakeLists.txt

cmake_minimum_required (VERSION 2.6)
project (Tutorial)
# The version number.
set (Tutorial_VERSION_MAJOR 1)
set (Tutorial_VERSION_MINOR 0)

# configure a header file to pass some of the CMake settings
# to the source code
configure_file (
  "${PROJECT_SOURCE_DIR}/TutorialConfig.h.in"
  "${PROJECT_BINARY_DIR}/TutorialConfig.h"
  )

# add the binary tree to the search path for include files
# so that we will find TutorialConfig.h
include_directories("${PROJECT_BINARY_DIR}/src")

# add the executable
add_executable(Tutorial src/tutorial.cpp)

This is the tutorial I'm working on.