Error when installing snapshot

[sjPlot]

I got following error when I try to install the latest snapshot of haven:

> library(devtools)
> devtools::install_github("hadley/haven")
Downloading github repo hadley/haven@master
Installing haven
'/Library/Frameworks/R.framework/Resources/bin/R' --vanilla CMD INSTALL  \
'/private/var/folders/k4/qfl_sg2s12d9z7p2c3qlrvqh0000gn/T/Rtmp6Em6Gr/devtoolsa1f23674344/hadley-haven-ac66b3d'  \
  --library='/Library/Frameworks/R.framework/Versions/3.1/Resources/library' --install-tests 

* installing *source* package ‘haven’ ...
** libs
clang -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG  -I/usr/local/include -I/usr/local/include/freetype2 -I/opt/X11/include -I"/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include" -I"/Library/Frameworks/R.framework/Versions/3.1/Resources/library/BH/include"   -fPIC  -Wall -mtune=core2 -g -O2  -c CKHashTable.c -o CKHashTable.o
clang++ -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG  -I/usr/local/include -I/usr/local/include/freetype2 -I/opt/X11/include -I"/Library/Frameworks/R.framework/Versions/3.1/Resources/library/Rcpp/include" -I"/Library/Frameworks/R.framework/Versions/3.1/Resources/library/BH/include"   -fPIC  -Wall -mtune=core2 -g -O2  -c DfBuilder.cpp -o DfBuilder.o
DfBuilder.cpp:188:7: error: use of undeclared identifier 'warning'
      warning("Unsupported label type: %s", type);
      ^
1 error generated.
make: *** [DfBuilder.o] Error 1
ERROR: compilation failed for package ‘haven’
* removing ‘/Library/Frameworks/R.framework/Versions/3.1/Resources/library/haven’
Fehler: Command failed (1)
>