to trigger the certificate prompt: svn list https://svn.code.sf.net/p/netpbm/code/stable
When asked if you want to (R)eject, accept (t)emporarily, or accept (p)ermanently, type p and press Enter . Restart the installation: brew install graphviz Alternative Solutions error graphviz failed to download resource netpbm
Sometimes the download fails because the system's default svn client is outdated or missing. Try installing a fresh version via Homebrew before attempting the Graphviz install again: brew install svn brew install graphviz to trigger the certificate prompt: svn list https://svn