Obtain the appropriate P4Eclipse plugin version from our FTP site.
* Note that this example uses release 2012.2, build 486944, and these values will change over time.
Unzip the archive obtained from the FTP site into a temp directory.
A few jars must be unpacked.
jar -xvf com.perforce.team.feature_2012.2.486944.jar
jar -xvf com.perforce.team.ui_2012.2.486944.jar
jar -xvf com.perforce.team.help.ui_2012.2.486944.jar
jar -xvf com.perforce.team.branding_2012.2.486944.jar
In the Eclipse install directory (ECLIPSE_HOME), move the components to the plugins and features directories as appropriate.
Restart Eclipse in order to see the new Perforce perspective.
See KB Article "Getting-Started-with-Eclipse-and-P4Eclipse" for next steps.