Rcpp installation error - '::Rf_pythag'

rcpp
package-installation

#1

When trying to install Rcpp_0.12.14 or Rcpp_0.12.9, I get the following error:

../inst/include/Rcpp/Rmath.h:222:55 error: '::Rf_pythag' has not been declared

Does anybody have any idea what the issue is?