Adapt Python detection to older cmake versions

With cmake < 3.12, the FindPython module does not exist yet. Use
FindPythonInterp and FindPythonLibs instead.

Author: morxa

wrappers/python/CMakeLists.txt

@@ -7,10 +7,16 @@ if (NOT BUILD_PYTHON_BINDINGS)
     message(WARNING "Python Bindings being built despite unset option because they are required for python documentation")
 endif()
 
-find_package(Python REQUIRED COMPONENTS Interpreter Development)
-
-set(PYTHON_INSTALL_DIR "${Python_SITEARCH}/pyrealsense2" CACHE PATH "Installation directory for Python bindings")
-set(CMAKECONFIG_PY_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/pyrealsense2")
+if (CMAKE_VERSION VERSION_LESS 3.12)
+  find_package(PythonInterp REQUIRED)
+  find_package(PythonLibs REQUIRED)
+  set(PYTHON_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/python${PYTHON_VERSION_MAJOR}.${PYTHON_VERSION_MINOR}/pyrealsense2" CACHE PATH "Installation directory for Python bindings")
+  set(CMAKECONFIG_PY_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/pyrealsense2")
+else()
+  find_package(Python REQUIRED COMPONENTS Interpreter Development)
+  set(PYTHON_INSTALL_DIR "${Python_SITEARCH}/pyrealsense2" CACHE PATH "Installation directory for Python bindings")
+  set(CMAKECONFIG_PY_INSTALL_DIR "${CMAKE_INSTALL_LIBDIR}/cmake/pyrealsense2")
+endif()
 
 set(DEPENDENCIES realsense2)