Placekey install failed on Ubuntu

[acwagnerucd]

I installed h3 and then attempted to install Placekey using the following command:
remotes::install_github("josiahparry/placekey")

I received the following error (see below). Your assistance would be appreciated.

`Downloading GitHub repo josiahparry/placekey@HEAD
✓ checking for file ‘/tmp/Rtmp7p4xTa/remotes2d9aa93cdcb/JosiahParry-placekey-4011219/DESCRIPTION’ ...
─ preparing ‘placekey’:
✓ checking DESCRIPTION meta-information ...
─ cleaning src
─ checking for LF line-endings in source and make files and shell scripts
─ checking for empty or unneeded directories
─ building ‘placekey_0.1.0.tar.gz’

Installing package into ‘/home/awagner/R/x86_64-pc-linux-gnu-library/4.1’
(as ‘lib’ is unspecified)

• installing source package ‘placekey’ ...
  ** using staged installation
  ** libs
  g++ -std=gnu++14 -I"/usr/share/R/include" -DNDEBUG -I'/home/awagner/R/x86_64-pc-linux-gnu-library/4.1/Rcpp/include' -fpic -g -O2 -fdebug-prefix-map=/build/r-base-5XUBcI/r-base-4.1.1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c RcppExports.cpp -o RcppExports.o
  g++ -std=gnu++14 -I"/usr/share/R/include" -DNDEBUG -I'/home/awagner/R/x86_64-pc-linux-gnu-library/4.1/Rcpp/include' -fpic -g -O2 -fdebug-prefix-map=/build/r-base-5XUBcI/r-base-4.1.1=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2 -g -c h3api.cpp -o h3api.o
  h3api.cpp:2:10: fatal error: h3/h3api.h: No such file or directory
  #include <h3/h3api.h>
  ^~~~~~~~~~~~
  compilation terminated.
  /usr/lib/R/etc/Makeconf:177: recipe for target 'h3api.o' failed
  make: *** [h3api.o] Error 1
  ERROR: compilation failed for package ‘placekey’
• removing ‘/home/awagner/R/x86_64-pc-linux-gnu-library/4.1/placekey’
  Warning message:
  In i.p(...) :
  installation of package ‘/tmp/Rtmp7p4xTa/file2d9a6ec72bba/placekey_0.1.0.tar.gz’ had non-zero exit status`