[Rd] R CMD build should fail early for old package versions?

[Toby Hocking]

Hi all,

Today I had an R CMD build that failed while building a vignette because
the vignette needs tidyr (>= 1.0, declared in DESCRIPTION Suggests) but my
system had a previous version installed.

It did not take me too long to figure out the issue (solved by upgrading
tidyr) but it would have been even faster / easier if R CMD build failed
early, with an error message that says something like "Can not build
package XXX because it Suggests: tidyr (>= 1.0) but tidyr 0.8.3 is
installed"

Is that possible?

Toby

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