This is probably because stringi does not compile on r-hub, and
ggplot2 depends on stringi.
This is a known and as of yet unsolved issue:


On Tue, Feb 13, 2018 at 10:58 PM, Dev Chakraborty <> wrote:
> My package RJafroc, which is currently on CRAN, passes all operating
> systems except solaris-x86-patched, and as a result has been flagged for
> removal. Using R-hub builder, I am unable to reproduce the log file because
> a required package, ggplot2, does not exist for Solaris. I found the
> following conversation on GitHub at the following URL:
> (the conversation is
> reproduced below).
> Could use any advice. Thanks.
> Dev
> **********************************************
> tdhock commented on Sep 23, 2017
> Hey there, it seems that ggplot2 on CRAN has an ERROR on solaris
> laris-x86/ggplot2-00check.html because of a test about date scales that
> does not pass. Do you have any plan to fix?
> This is an issue for me because I have a package that imports ggplot2, and
> I would like to use rhub to check it on solaris before submitting it to
> CRAN. *However rhub can not perform the check because the ggplot2 package
> is not available on solaris*. Here is the related issue at rhub
> r-hub/rhub#83
>  @hadley
>  Owner
> hadley commented on Oct 30, 2017
> *Probably not, since solaris is going away.*
>         [[alternative HTML version deleted]]
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