To check, the command xcode-select -p outputs a file path beginning with /Applications/Xcode.app/ if they are already installed. XCode and Command Line ToolsĮnsure that you have installed the XCode Command Line Tools. This guide assumes that you’re running MacOS Sierra or later. If privacy and security are of the utmost concern, generate all certificates and keys on a “clean” machine and verify the signatures of each download. on Ubuntu: apt-get install openvpn easy-rsa). The instructions are very similar for most flavours of linux such as Ubuntu once the correct packages are installed (e.g. This guide covers how to create certificates and keys for OpenVPN server and clients using the EasyRSA tool on MacOS.