Thank you abhirame. solved, and trying YDK.

Thanks, but already installed libssh.and reinstalled libssh but still error.   (YDKenv) MacBookPro-2:ydk-gen takumi$ brew install libsshUpdating Homebrew...==> Auto-updated Homebrew!Updated 2 taps (homebrew/core, homebrew/cask).==> New Formulaecarla ...

Hi I tried these but I couldn't. Error occurred while generating libydk.Is there any resolution?It is High sierra 10.13.6 Thanks   ---(YDKenv) MacBookPro-2:YDKenv takumi$ pip listPackage Version---------- -------pip 18.0setuptools 40.2.0wheel 0.31.1(...