I'm trying to install the Feedzirra gem to do some work with RSS feeds. One documented issue with the installation is the need to install libcurl3-dev to address a common error in the installation process.
I came across this solution: Feedzirra and How I Installed it but it's for Ubuntu.
sudo apt-get install libcurl3-dev
I'm running ruby on rails on a Mac and was hoping someone could tell me the equivalent command for my system.
apt-get
for OS X. So you may want to use that. This is really off-topic for Stack Overflow (or marginally on-topic as it pertains peripherally to install Ruby gems), so I recommend asking on Unix.SE or Ask Different instead. (Please read their FAQs and consider which would be appropriate given your question.)