他的回复:
根据上面的安装步骤 6) 执行以下命令,构建编译环境。 scl enable devtoolset-7 "/usr/local/bin/pip2 install -r buildscripts/requirements.txt" 执行第六步以后,报了这个错: Failed to bulid cryptography ERROR Could not build wheels for cryptography which use PEP 517 and cannot be installed directly