Package manager and Travis

I'm using travis and the public RSPM. The issue is

Error: package or namespace load failed for ‘Rcpp’ in dyn.load(file, DLLpath = DLLpath, ...):
 unable to load shared object '/home/travis/R/Library/Rcpp/libs/':
  /home/travis/R/Library/Rcpp/libs/ undefined symbol: EXTPTR_PTR
In addition: Warning message:
package ‘Rcpp’ was built under R version 4.0.2 
Execution halted
The command "Rscript -e "library('Rcpp')"" exited with 1.

I've tried deleting the cache.

This is a bug in Rcpp where the package built on >= R 4.0.1 will fail to load on R 4.0.0:

Is it possible to use R 4.0.1 or 4.0.2 on Travis? If not, you might have to install Rcpp from source for now. This should be fixed in the development version of Rcpp, but I don't think it's been released to CRAN yet.