(use-modules (gnu packages)
             (guix gnu-maintenance)
             (ice-9 pretty-print))

(define gnu-packages (official-gnu-packages))

(define available-gnu-packages (map gnu-package-name gnu-packages))

(define missing-gnu-packages
  (filter (lambda (x)
            (null? (find-packages-by-name
                    (gnu-package-name x))))
          gnu-packages))

(pretty-print (map gnu-package-name missing-gnu-packages))

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