durmod fails to install with dev. Rcpp

[kevinushey]

Related to cce9e61.

kevinushey@Kevins-MBP:~/r/pkg
$ R CMD INSTALL --preclean durmod
* installing to library ‘/Users/kevinushey/Library/R/3.6/library’
* installing *source* package ‘durmod’ ...
** using staged installation
** libs
clang++ -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG  -I"/Users/kevinushey/Library/R/3.6/library/Rcpp/include" -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include -I/usr/local/opt/libomp/include -Xpreprocessor -fopenmp    -fPIC  -g -O3 -pipe -Wall -pedantic -fstack-protector-all -c RcppExports.cpp -o RcppExports.o
clang++ -std=gnu++11 -I"/Library/Frameworks/R.framework/Resources/include" -DNDEBUG  -I"/Users/kevinushey/Library/R/3.6/library/Rcpp/include" -isysroot /Library/Developer/CommandLineTools/SDKs/MacOSX.sdk -I/usr/local/include -I/usr/local/opt/libomp/include -Xpreprocessor -fopenmp    -fPIC  -g -O3 -pipe -Wall -pedantic -fstack-protector-all -c cfunctions.cpp -o cfunctions.o
In file included from cfunctions.cpp:6:
In file included from /Users/kevinushey/Library/R/3.6/library/Rcpp/include/Rcpp.h:27:
In file included from /Users/kevinushey/Library/R/3.6/library/Rcpp/include/RcppCommon.h:128:
/Users/kevinushey/Library/R/3.6/library/Rcpp/include/Rcpp/exceptions.h:112:53: warning: all paths through this function will call
      itself [-Winfinite-recursion]
    inline void warning(const std::string& message) {        // #nocov start
                                                    ^
cfunctions.cpp:31:3: error: reference to 'debug' is ambiguous
  debug=dodebug;
  ^
cfunctions.cpp:28:13: note: candidate found by name lookup is 'debug'
static bool debug = false;
            ^
/Users/kevinushey/Library/R/3.6/library/Rcpp/include/Rcpp/macros/macros.h:28:11: note: candidate found by name lookup is
      'Rcpp::debug'
namespace debug {
          ^
1 warning and 1 error generated.
make: *** [cfunctions.o] Error 1
make: *** Waiting for unfinished jobs....
ERROR: compilation failed for package ‘durmod’
* removing ‘/Users/kevinushey/Library/R/3.6/library/durmod’