hello_imgui provides CMake targets and hello_imgui_add_app:

Usage with `hello_imgui_add_app` (recommended)
    set(CMAKE_CXX_STANDARD 17)
    find_package(hello-imgui CONFIG REQUIRED)
    hello_imgui_add_app(test test.cpp)      # see example below

Usage with `target_link_libraries`
    set(CMAKE_CXX_STANDARD 17)
    find_package(hello-imgui CONFIG REQUIRED)
    # Note the subtle difference between the package name and the target name: hello-imgui vs hello_imgui!
    target_link_libraries(main PRIVATE hello-imgui::hello_imgui)
    # this mode will ignore all of hello_imgui cmake tooling, and will not deploy the assets

Example test.cpp:
    #include "hello_imgui/hello_imgui.h"
    int main() { HelloImGui::Run([](){ ImGui::Text("Hello, world!"); ImGui::ShowDemoWindow(); }); }