Manifest attached. :-)
(use-modules (gnu packages)
(guix build-system gnu)
(guix build-system cmake)
(guix packages)
(guix sets)
(ice-9 match)
(ice-9 vlist)
(srfi srfi-1))
(define all (all-packages))
(define (p->k p)
(string-append (package-name p) "@" (package-version p)))
(define vall-packages
(fold (lambda (package result)
(vhash-cons (p->k package) package result))
vlist-null
all))
(define vleaf-packages
(vhash-fold (lambda (key package result)
(let loop ((dependencies (package-direct-inputs package))
(updated result))
(match dependencies
('() updated)
((or ((_ p) . tail)
((_ p _) . tail))
(if (package? p)
(loop tail
(vhash-delete (p->k p) updated))
(loop tail updated))))))
vall-packages
vall-packages))
(define leaf-packages
(vhash-fold (lambda (key package result)
(cons package result))
'()
vleaf-packages))
(define subset
(filter-map (lambda (package)
(and (memq (package-build-system package)
(list gnu-build-system cmake-build-system))
(package-with-upstream-version (pk 'up package))))
leaf-packages))
(packages->manifest
subset)
