Rclusterpp.h file not found

devtools::install_github("nolanlab/Rclusterpp")
Downloading GitHub repo nolanlab/Rclusterpp@master
from URL https://api.github.com/repos/nolanlab/Rclusterpp/zipball/master
Installing Rclusterpp
'/Library/Frameworks/R.framework/Resources/bin/R' --no-site-file --no-environ --no-save --no-restore --quiet CMD INSTALL  \
  '/private/var/folders/x3/58m75cp15bl_6jkpclyt_6qc0000gn/T/RtmpoXJ6kN/devtoolse585c7f2673/nolanlab-Rclusterpp-740cb0b'  \
  --library='/Library/Frameworks/R.framework/Versions/3.4/Resources/library' --install-tests 

* installing *source* package ‘Rclusterpp’ ...
** libs
/usr/local/clang4/bin/clang++ -I/Library/Frameworks/R.framework/Resources/include -DNDEBUG  -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/Rcpp/include" -I"/Library/Frameworks/R.framework/Versions/3.4/Resources/library/RcppEigen/include" -I/usr/local/include  -fopenmp -fPIC  -Wall -g -O2  -c hclust.cpp -o hclust.o
hclust.cpp:7:10: fatal error: 'Rclusterpp.h' file not found
#include <Rclusterpp.h>
         ^~~~~~~~~~~~~~
1 error generated.
make: *** [hclust.o] Error 1
ERROR: compilation failed for package ‘Rclusterpp’
* removing ‘/Library/Frameworks/R.framework/Versions/3.4/Resources/library/Rclusterpp’
Installation failed: Command failed (1)
nolanlab / Rclusterpp

Rclusterpp.h file not found #9
