Need help in creating libccv.so

Hi, I am using ccvwrapper from https://zablo.net/blog/post/stroke-width-transform-swt-python/index.html. When i tried clang to make .so file on ccvwrapper it is missing required symbols. I tried using steps mentioned https://pypi.org/project/ccv/ , but the patching is not working. Can anyone assist me creating wrapper on ccv . Thanks, Arun.