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This is fully documented on the wiki. See wiki/ROS/EnvironmentVariables - ROS_LANG_DISABLE:

A colon-separated list of package names for message generators / client libraries that should be disabled. Message-generation will not happen for languages in this list.

For packages build with catkin you need to list the names of the message generators which should be ignored, e.g.:

export ROS_LANG_DISABLE=genlisp

It then goes on to say:

Note that before disabling a language, you should first be very sure that none of the code you're using requires that language's bindings.