glue could not be installed using R-3.1

[FlorianPein]

I could not install glue using R-3.1 which according to the Description file should be possible. It failed because it could not find the function "isNamespaceLoaded" (added to R in R-3.2).

[jimhester]

You are right the version requirement should have been bumped, it now is R >= 3.2