Could NOT find PY_pip (missing: PY_PIP)

Could NOT find PY_pip (missing: PY_PIP)

-- Found PythonInterp: /usr/bin/python3.6 (found suitable version "3.6.9", minimum required is "3.6")
-- Found PythonLibs: /home/lvying/miniconda3/envs/ppocr/lib (found suitable version "3.7.10", minimum required is "3.6")
-- Could NOT find PY_pip (missing: PY_PIP)
CMake Error at cmake/python_module.cmake:27 (message):
  python module pip is not found
Call Stack (most recent call first):
  cmake/external/python.cmake:68 (find_python_module)
  cmake/third_party.cmake:238 (include)
  CMakeLists.txt:315 (include)

-- Configuring incomplete, errors occurred!