Porter requires duffle, so make sure you have duffle installed.
curl https://deislabs.blob.core.windows.net/porter/latest/install-mac.sh | bash
curl https://deislabs.blob.core.windows.net/porter/latest/install-linux.sh | bash
iwr ‘https://deislabs.blob.core.windows.net/porter/latest/install-windows.ps1' -UseBasicParsing | iex