Here’s what I did to install the Group Message plugin for Pidgin on my Ubuntu Intrepid machine. Note that this worked for me but doesn’t mean that it will work for you. If you’re using Ubuntu or any of the Ubuntu flavors then you might want to give it a try.
Note: You have to do the following as root
Step 1: Get the Build Dependencies
$ apt-get build-dep pidgin-plugin-pack
Step 2: Prepare the Source
$ mkdir pidgin-plugin-pack; cd pidgin-plugin-pack
$ apt-get source pidgin-plugin-pack
$ cd purple-plugin-pack*
Step 3: Enable the Group Message plugin
$ rm groupmsg/.abusive
$ touch groupmsg/.build
Step 4: Build the Pidgin Plugin Pack Package
$ dpkg-buildpackage -b -nc
Step 5: Install the Pidgin Plugin Pack Package
$ cd ../
$ dpkg -i pidgin-plugin-pack*
Step 6: (Optional) Do some clean-up
$ cd ../
$ rm -dfr pidgin-plugin-pack
$ apt-get autoremove
Now, all you have to do is re-start Pidgin and enable the plugin. Remember, with great power comes great responsibility. Don’t spam people with this plugin.
I hope this helps!