‘Rcpp’ was installed by an R version with different internals


Newbie here - apologies in advance...
I've got:

platform x86_64-apple-darwin15.6.0
arch x86_64
os darwin15.6.0
system x86_64, darwin15.6.0
status Under development (unstable)
major 3
minor 5.0
year 2017
month 04
day 10
svn rev 72501
language R
version.string R Under development (unstable) (2017-04-10 r72501)
nickname Unsuffered Consequences

and want to play with Rcpp:

trying URL 'https://cran.rstudio.com/bin/macosx/el-capitan/contrib/3.5/Rcpp_0.12.17.tgz'
Content type 'application/x-gzip' length 4560707 bytes (4.3 MB)
downloaded 4.3 MB

The downloaded binary packages are in

Error: package ‘Rcpp’ was installed by an R version with different internals; it needs to be reinstalled for use with this R version

I see there's some discussion of this topic, but even after reading those posts, it's unclear how to resolve it.

I'm hoping whatever solution(s) are suggested will help educate me in R.

thanks, Randy


You probably installed Rcpp with earlier version of R (e.g., 3.4.4). With major updates (second number to go up, so 3.4.4 -> 3.5.0) all packages should be reinstalled since, as you can see from the error, a lot of things changed internally.

So your course of action is as simple as delete all packages and reinstall them once again.

Also, where did you get 3.5.0 version? From the output of version you are now using unstable branch. You should probably install official 3.5.0 release that happened in April this year.


Thank you very much! I honestly hadn't noticed the "unstable"; I simply saw 3 and 5.0. Duh. Anyway, I've downloaded the stable R-3.5.0.pkg from https://cran.r-project.org/bin/macosx/ and can now successfully load Rcpp. I'm off & running... until my next question :slight_smile: