Using specific versions of formula with Homebrew

By Camilla Krag Jensen naxoc |

I have my LAMP stack and other things set up on my mac with the wonderful Homebrew.

I recently did a brew upgrade on my system and it seemed that everything went smooth. But when I later ran PHP from the command line I got this error:

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/local/Cellar/memcached-php/2.0.1/' - dlopen(/usr/local/Cellar/memcached-php/2.0.1/, 9): Library not loaded: /usr/local/lib/libmemcached.9.dylib
  Referenced from: /usr/local/Cellar/memcached-php/2.0.1/
  Reason: image not found in Unknown on line 0

I poked around in my php.ini to see if the wrong file was being included or something like that, but it turned out that I had upgraded to a newer version of libmemcached than the one memcached was using. So I needed to downgrade libmemcached. Here is how to switch to any version available with Homebrew:

  • brew versions libmemcached

  • Find and note the version number you want. In my case I wasn't sure, so I just went with the second newest and that worked.

  • brew switch libmemcached 1.0.4

Change the version number and the formula above to whatever makes sense for what you are doing.

The example above is using a command that is an external command for Homebrew. It works super fast and is easy to use.