[Rcpp-devel] inline error

Dear Rcpp::Users and Rcpp::Devels,

I get a weird error when using inline and I want to know, where it comes from. I run the following code:

library(Rcpp)
library(inline)
cfunc <- cxxfunction(signature(start="vector"), body = "Rcpp::NumericVector x(start); return 1;", plugins = "Rcpp?)

And I get the following Error:

Error in compileCode(f, code, language = language, verbose = verbose) :
  Compilation ERROR, function(s)/method(s) not created! file1606062c0507.cpp: In function ?SEXPREC* file1606062c0507(SEXP)?:
file1606062c0507.cpp:19:1: error: ?Rcpp? has not been declared
 Rcpp::NumericVector x(start); return 1;
 ^
file1606062c0507.cpp:19:21: error: expected ?;? before ?x?
 Rcpp::NumericVector x(start); return 1;
                     ^
file1606062c0507.cpp:19:38: error: invalid conversion from ?int? to ?SEXP? [-fpermissive]
 Rcpp::NumericVector x(start); return 1;
                                      ^
make: *** [file1606062c0507.o] Error 1
In addition: Warning message:
running command '/Library/Frameworks/R.framework/Resources/bin/R CMD SHLIB file1606062c0507.cpp 2> file1606062c0507.cpp.err.txt' had status 1

Best
Simon