Compilation error during install

I am using the following command to install shinytest2:

R -e "install.packages(c('shinytest2'), repos='https://cran.rstudio.com')"

And I am getting the errors:

code.cpp:34:5: error: ‘cpp11::doubles_matrix’ {aka ‘cpp11::matrix<cpp11::r_vector<double>, double>’} is not a template
   34 |     cpp11::doubles_matrix<by_column> diff_matrix,
      |     ^~~~~
code.cpp:34:27: error: ‘by_column’ was not declared in this scope
   34 |     cpp11::doubles_matrix<by_column> diff_matrix,
      |                           ^~~~~~~~~
code.cpp: In function ‘double image_diff_convolution_max_value(cpp11::doubles_matrix, int)’:
code.cpp:47:3: error: ‘cpp11::writable::doubles_matrix’ {aka ‘cpp11::matrix<cpp11::writable::r_vector<double>, cpp11::writable::r_vector<double>::proxy>’} is not a template
   47 |   cpp11::writable::doubles_matrix<by_column>
      |   ^~~~~
code.cpp:47:35: error: ‘by_column’ was not declared in this scope
   47 |   cpp11::writable::doubles_matrix<by_column>
      |                                   ^~~~~~~~~
make: *** [/usr/lib/R/etc/Makeconf:181: code.o] Error 1
ERROR: compilation failed for package ‘shinytest2’

I notice in src/code.cpp the directive #include <cpp11.hpp>; however, there is no such file in the src directory (or in the whole repository). Could this be the issue?

Thanks,
Daniel Cotter

Reproduce the CRAN installation command and inspect src/code.cpp alongside the reported compiler output. Check how the cpp11 dependency and its matrix types are provided during the package build; done means shinytest2 installs without the compilation errors.