I tried to install crf++. I downloaded CRF++-0.58 from https://taku910.github.io/crfpp/#download. Then I followed the instructins on the official website of crf++.
I firstly entered the folder named CRF++-0.58. Then I typed following code in terminal:
./configure
And the result was:
-bash: ./configure: No such file or directory
Then I checked the file 'CRF++-0.58', there's no configure file. I don't know if it's the problem of crf++ or mine.