I just received a bug report about the rgl package: it claims to depend
on R >= 3.2.0, but actually uses the hcl.colors() function that was
introduced in R 3.6.0, so fails to install. (This dependence was
introduced while I had the dependence stated as R >= 4.0.0 for a while,
until I tried to help people stuck on old releases; I fixed some of the
4.0.0 needs, but missed this one.)
So of course what I should have done was to run the checks on R 3.2.0
(and maybe intermediate versions) to confirm it works, but I didn't try
that before releasing to CRAN.
I've just finished installing a copy of R 3.2.0 and testing my fix, so I
think things are fine now. This took some work; some of the packages
used by the current rgl didn't exist when R 3.2.0 was current, so no
binaries exist for them; installing the tools for binary builds takes
time, etc.
So finally, my question: what is the recommended way to handle tests of
new packages on old R versions? Do docker or other images exist that
are already set up and ready to go?
Duncan Murdoch
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