public VariableDecls declareVar(String bootiqueVariable) {
		this.extender.declareVar(bootiqueVariable, VariableNames.toEnvironmentVariableName(bootiqueVariable));
		return this;
	}
public VariableDecls declareVar ( String bootiqueVariable ) { this . extender . declareVar ( bootiqueVariable , VariableNames . toEnvironmentVariableName ( bootiqueVariable ) ) ; return this ; }
Declare an environment variable which is linked to the given Bootique variable, and has its name defined
from the name of the Bootique variable.

@param bootiqueVariable the name of the bootique variable.
@return the Bootique extender.