import/cran: Add vignette builder to native inputs.
authorRicardo Wurmus <rekado@elephly.net>
Sat, 7 Mar 2020 18:30:51 +0000 (19:30 +0100)
committerRicardo Wurmus <rekado@elephly.net>
Sat, 7 Mar 2020 18:31:47 +0000 (19:31 +0100)
commitc363722e81a8aa54f64468db9fcc42ef8dd74944
tree34fa0b7471dd440af8c41fbe89bcddbd17b90245
parent67133278ec8f1bace05a8347e4115965e9b679a8
import/cran: Add vignette builder to native inputs.

* guix/import/cran.scm (needs-knitr?): New procedure.
(description->package): Use it.
guix/import/cran.scm