R 3.2 on travis - jsonlite error - "undefined symbol R_GetConnection"

The R_GetConnection API is only called for R >= 3.3, so it should not be called by R 3.2 at all.

I think you are using a version of r-cran-jsonlite which was built using a more recent version of R, but then trying to load it in an older version. Try installing jsonlite from source.

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