Fix find_package

CMakeLists.txt

@@ -49,7 +49,9 @@ endif()
 # Running find_package(PythonInterp) to retrieve the Python version
 # which is not exported by Pybind11's cmake.
 # Cf. https://github.com/pybind/pybind11/issues/2268
-find_package(PythonInterp ${PythonLibsNew_FIND_VERSION} REQUIRED)
+#find_package(PythonInterp ${PythonLibsNew_FIND_VERSION} REQUIRED)
+# the above line uses a deprecated cmake method, use the following instead
+find_package(Python COMPONENTS Interpreter Development.Module NumPy REQUIRED)
 
 set(pybind11_REQUIRED_VERSION 2.6.1)
 if(TARGET pybind11 OR TARGET pybind11::headers)
@@ -60,13 +62,7 @@ else()
     message(STATUS "Found pybind11: ${pybind11_INCLUDE_DIRS}/pybind11")
 endif()
 
-# Look for NumPy headers, except if NUMPY_INCLUDE_DIRS is passed,
-# which is required under some circumstances (such as wasm, where
-# there is no real python executable)
-if(NOT NUMPY_INCLUDE_DIRS)
-    find_package(NumPy REQUIRED)
-endif()
-message(STATUS "Found numpy: ${NUMPY_INCLUDE_DIRS}")
+message(STATUS "Found numpy: ${Python_NumPy_INCLUDE_DIR}")
 
 # Build
 # =====
@@ -85,7 +81,7 @@ set(XTENSOR_PYTHON_HEADERS
 
 add_library(xtensor-python INTERFACE)
 target_include_directories(xtensor-python INTERFACE
-    "$<BUILD_INTERFACE:${XTENSOR_PYTHON_INCLUDE_DIR};${pybind11_INCLUDE_DIRS};${NUMPY_INCLUDE_DIRS}>"
+    "$<BUILD_INTERFACE:${XTENSOR_PYTHON_INCLUDE_DIR};${pybind11_INCLUDE_DIRS};${Python_NumPy_INCLUDE_DIR}>"
     $<INSTALL_INTERFACE:include>)
 target_link_libraries(xtensor-python INTERFACE xtensor)
 get_target_property(inc_dir xtensor-python INTERFACE_INCLUDE_DIRECTORIES)