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    • 2 Dec 2009

      Macports, and Erlang: Setting up Emacs and your $MANPATH

      Written by Tim Bielawa

      You may find this helpful if you should find yourself using Erlang on OS X and you’ve installed it using Macports. After a default installation you’ll need to manually configure your .emacs file for erlang-mode and set your $MANPATH variable correctly, here’s how.

      If you’ve installed Erlang with Macports then you may have noticed that when you edit .erl files you’re not entering into erlang-mode, nor is it available to enter into. Here’s how I got erlang-mode working on my system.

      Macports will install Erlang into /opt/local/lib/erlang by default. The paths to put in your .emacs file provided in the erlang-mode documentation only need to be tweaked a slight bit to function properly. Here’s what I put in mine:

      (setq load-path (cons  "/opt/local/lib/erlang/lib/tools-2.6.4/emacs/" load-path))
      (setq erlang-root-dir "/opt/local/lib/erlang")
      (setq exec-path (cons "/opt/local/bin" exec-path))
      (require 'erlang-start)

      Note that you may require setting “tools-2.6.4” to something else if Macports has upgraded it’s distribution of Erlang.

      Setting up your $MANPATH variable is fairly simple as well. Just put the string “/opt/local/lib/erlang/man” in a file called ‘erlang’ in /etc/manpaths.d/ and make sure it ends with an empty line. Test this by opening a new terminal and running: echo $MANPATH | grep erlang. If it doesn’t come back empty then you’ve done it right.

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