nonfree is optional for Python module now

modules/python/CMakeLists.txt

@@ -10,7 +10,7 @@ if(ANDROID OR IOS OR NOT PYTHONLIBS_FOUND OR NOT PYTHON_USE_NUMPY)
 endif()
 
 set(the_description "The python bindings")
-ocv_add_module(python BINDINGS opencv_core opencv_flann opencv_imgproc opencv_video opencv_ml opencv_features2d opencv_highgui opencv_calib3d opencv_photo opencv_nonfree opencv_objdetect opencv_legacy)
+ocv_add_module(python BINDINGS opencv_core opencv_flann opencv_imgproc opencv_video opencv_ml opencv_features2d opencv_highgui opencv_calib3d opencv_photo opencv_objdetect opencv_legacy OPTIONAL opencv_nonfree)
 
 add_definitions(-DPYTHON_USE_NUMPY=1)
 
@@ -30,11 +30,14 @@ set(opencv_hdrs
     "${OPENCV_MODULE_opencv_highgui_LOCATION}/include/opencv2/highgui/highgui.hpp"
     "${OPENCV_MODULE_opencv_ml_LOCATION}/include/opencv2/ml/ml.hpp"
     "${OPENCV_MODULE_opencv_features2d_LOCATION}/include/opencv2/features2d/features2d.hpp"
-    "${OPENCV_MODULE_opencv_nonfree_LOCATION}/include/opencv2/nonfree/features2d.hpp"
-    "${OPENCV_MODULE_opencv_nonfree_LOCATION}/include/opencv2/nonfree/nonfree.hpp"
     "${OPENCV_MODULE_opencv_calib3d_LOCATION}/include/opencv2/calib3d/calib3d.hpp"
     "${OPENCV_MODULE_opencv_objdetect_LOCATION}/include/opencv2/objdetect/objdetect.hpp")
 
+if(HAVE_opencv_nonfree)
+  list(APPEND opencv_hdrs     "${OPENCV_MODULE_opencv_nonfree_LOCATION}/include/opencv2/nonfree/features2d.hpp"
+                              "${OPENCV_MODULE_opencv_nonfree_LOCATION}/include/opencv2/nonfree/nonfree.hpp")
+endif()
+
 set(cv2_generated_hdrs
     "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_generated_funcs.h"
     "${CMAKE_CURRENT_BINARY_DIR}/pyopencv_generated_func_tab.h"