Well, I found the Groovy script to do it:
properties([[$class: 'ParametersDefinitionProperty', parameterDefinitions:
[[$class: 'ChoiceParameterDefinition', choices: 'centos\nredhat\nmylittlepony\nheman', description: 'Please choose a platform', name: 'PLATFORM'],
[$class: 'StringParameterDefinition', description: 'Custom configure options', name: 'CONFIGURE_OPTS']]]])
etc.
Is there a simple DSL statement that encapsulates the above? Man, the Jenkins doc is "challenging" to say the least.
-aps