maybe this will make Dirk happy

romainfrancois · romainfrancois · commit 8e3d71083ca4 · 2010-12-05T08:10:37.000Z
diff --git a/inst/include/Rcpp/sprintf.h b/inst/include/Rcpp/sprintf.h
@@ -20,6 +20,7 @@
 // along with Rcpp.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <cstdio>
+#include <cstdarg>
 
 namespace Rcpp{
 
