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Fixes #2956
This PR provides two workarounds:
vdiffr
only whenUSE_VDIFFR=true
since vdiffr now requires R >= 3.2.0, which means builds with R 3.1 fails.R_REMOTES_NO_ERRORS_FROM_WARNINGS=true
to avoid errors converted from warnings raised bydevtools::install_deps()
, which didn't seem to exist before devtools 2.0.