p5-Params-Validate has an extra module, Attribute::Params::Validate, which uses Attribute::Handlers, which requires perl 5.6 or above. This is an add-on functionality which is not necessary for main module operation.
Responsible Changed From-To: freebsd-ports-bugs->tobez I'll work with the port maintainer on this.
State Changed From-To: open->closed Committed.