The advice at the link you cite ([1]
https://stackoverflow.com/a/8638902/1664978) is not quite right:
> I believe it is a requirement that if package A imports package B, and
> package B lists package C in Depends: then package A must also list
> package C in Depends:
> A popular stackoverflow answer states this.[1] I can't find any other
> source but it makes sense.
You don't need (and in general should not) put a package in Depends only
because some of your imports do. In some cases you may have to, but this is
only because of missing imports in the package you import. Note that even if
the package you import (package B) "Depends" on package "C", "B" still needs
to import the functionality from "C" it needs (e.g. putting import(C)) in its
NAMESPACE file. These days 'R CMD check' enforces this but some older packages
on CRAN may not have the import() directives and in that case you have no
other option than to "Depend" on "C". (In this case, write to the package
maintainer to alert them about the problem.)
As to indirect dependency on R version I am also not clear.
Georgi
________________________________________
From: R-package-devel [r-package-devel-boun...@r-project.org] on behalf of Hugh
Parsonage [hugh.parson...@gmail.com]
Sent: 24 January 2018 13:44
To: r-package-devel@r-project.org
Subject: [R-pkg-devel] Is it ever appropriate (or mandatory) to Suggests: R
(>= version) ?
I believe it is a requirement that if package A imports package B, and
package B lists package C in Depends: then package A must also list
package C in Depends:
A popular stackoverflow answer states this.[1] I can't find any other
source but it makes sense.
What if package B is suggested by package A and package B depends on a
certain version of R? That is if package A *suggests* package B and
package B lists Depends: R (>= ver). In such a case, is it necessary
to list this dependency in Suggests? Certainly endnote 12 of WRE says
it would be necessary if the dependency were for a package, but
doesn't seem to mention similar dependencies on R version. And, as far
as I can see, no package on CRAN lists R in Suggests, so it would to
be non-standard if not prohibited.
S <- available.packages()
S[grepl("(?<!([A-Za-z]))R \\(", S[, "Suggests"], perl = TRUE), ]
[1] https://stackoverflow.com/a/8638902/1664978
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