static-if problem when using corfu

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Am having a go at corfu, but am getting  

   Lisp error: (void-function static-if)

 (static-if (< emacs-major-version 29) #'(lambda (x y) (and (equal x y) (equal (text-properties-at 0 x) (text-properties-at 0 y)))) #'equal-including-properties)
  (defalias 'corfu--equal-including-properties (static-if (< emacs-major-version 29) #'(lambda (x y) (and (equal x y) (equal (text-properties-at 0 x) (text-properties-at 0 y)))) #'equal-including-properties))
  eval-buffer(#<buffer  *load*-16011> nil "/home/hagbard/Opstk/bin/gungadin-1.0/typex/orellana/bazarsouk/paharganj/corfu/corfu-1.5/corfu.el" nil t)  ; Reading at buffer position 24858
  load-with-code-conversion("/home/hagbard/Opstk/typex/..." "/home/hagbard/Opstk/typex/..." nil t)
  require(corfu)


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