Receiving 'fatal error: cpp-terminal/private/signals.hpp: No such file or directory' error when attempting to include installed cpp-terminal library in my project

[kburchfiel]

Thank you for all your hard work on this library! I am quite new to CMake, and my C++ skills are very rusty, so my apologies in advance if the solution to my question is obvious to you.

After downloading and unzipping the cpp-terminal code onto my Linux Mint system and creating a 'build' folder within its directory, I installed it via the following commands:

cmake ..
cmake --build .
cmake --install .

In order to test out its incorporation into a C++ project, I created a separate folder that contains the following two files:

CMakeLists.txt:

cmake_minimum_required(VERSION 3.10)
project(typt2025)
set(CMAKE_CXX_STANDARD 11)
find_package(cpp-terminal REQUIRED)
add_executable(typt2025 typing_test_2025.cpp)
target_link_libraries(typt2025 PRIVATE cpp-terminal::cpp-terminal)

typing_test_2025.cpp:

// Source: https://github.com/jupyter-xeus/cpp-terminal/tree/master

#include "cpp-terminal/terminal.hpp"
#include <iostream>

int main()
{
  std::cout << "Just including terminal.hpp activate \033[31mcolor\033[0m !" << std::endl;
}

Next, I created a 'build' folder within this project folder and ran both cmake .. and cmake --build . However, the latter line resulted in the following error:

[ 50%] Building CXX object CMakeFiles/typt2025.dir/typing_test_2025.cpp.o
In file included from /usr/local/include/cpp-terminal/terminal.hpp:12,
                 from /home/kjb3/D1V1/Documents/!Dell64docs/Programming/CPP/typing_test_2025/typing_test_2025.cpp:4:
/usr/local/include/cpp-terminal/terminal_impl.hpp:13:10: fatal error: cpp-terminal/private/signals.hpp: No such file or directory
   13 | #include "cpp-terminal/private/signals.hpp"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
gmake[2]: *** [CMakeFiles/typt2025.dir/build.make:76: CMakeFiles/typt2025.dir/typing_test_2025.cpp.o] Error 1
gmake[1]: *** [CMakeFiles/Makefile2:83: CMakeFiles/typt2025.dir/all] Error 2
gmake: *** [Makefile:91: all] Error 2

For what it's worth, I'm not seeing a 'private' folder within /usr/local/include/cpp-terminal, though I do see both the 'private' folder and a signals.hpp file within the cpp-terminal/ folder in my downloaded copy of the code.

Thanks in advance for your help!