kivy-buildozer错误：似乎没有安装Cython

Question

我正在尝试使用buildozer制作我的python-kivy gui的apk，但该过程因错误error: Cython does not appear to be installed

而停止

`/home/koushik/Desktop/.buildozer/android/platform/python-for-android/build/python-install/lib/python2.7/distutils/dist.py:267: UserWarning: Unknown distribution option: 'install_requires'
  warnings.warn(msg)
running build_ext
failed to import Cython: /home/koushik/Desktop/.buildozer/android/platform/python-for-android/build/python-install/lib/python2.7/lib-dynload/_io.so: wrong ELF class: ELFCLASS32
error: Cython does not appear to be installed
# Command failed: ./distribute.sh -m "kivy" -d "rlc_and"
# 
# Buildozer failed to execute the last command

我不明白这一点，因为我已经安装了cython，那为什么说没有安装cython？我该如何解决这个问题？