[Rcpp-devel] Work-around for Stangle failure on Rcpp-modules.Rnw?

[Douglas Bates]

I have been unable to install Rcpp SVN revision 1758.  It fails to
build the package indices with error message

** building package indices ...
Error : running Stangle on vignette
'/home/bates/sloc/Rcpp/inst/doc/Rcpp-modules.Rnw' failed with message:
invalid value for 'lang' : cpp
ERROR: installing package indices failed

Can anyone suggest a work-around?