visual studio – CMake, VCPKG Manifest Mode installation fails to link and find headers after configuring with cmake - Faz Business

I’m trying to setup Visual Studio 2022 with some libraries using vcpkg.
I have set my vcpkg.json to something like this, I’m trying to get it working with
manifest mode.

    {
  "name": "whatever",
  "version-string": "whatever",
  "dependencies": [
    "fltk"
  ],
  "builtin-baseline": "6f1ddd6b6878e7e66fcc35c65ba1d8feec2e01f8"
}

I have a CMakeLists.txt file like this:

cmake_minimum_required (VERSION 3.8)
set(CMAKE_TOOLCHAIN_FILE "mylocationfor\\vcpkg.cmake")

project ("CMakeProject1")

find_package(FLTK CONFIG REQUIRED)
    
add_executable (test main.cpp)

target_link_libraries(main PRIVATE fltk fltk_gl fltk_forms fltk_images)

After running cmake -B build/ -S ..
I’m trying to roughly follow the documentation here.
https://learn.microsoft.com/en-us/vcpkg/consume/manifest-mode?tabs=cmake%2Cbuild-cmake
But when I do this. I have my main.cpp with some test code like this.

#include <iostream>
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>

int main(int argc, char** argv) {
    Fl_Window* window = new Fl_Window(340, 180);
    Fl_Box* box = new Fl_Box(20, 40, 300, 100, "Hello, World!");
    box->box(FL_UP_BOX);
    box->labelfont(FL_BOLD + FL_ITALIC);
    box->labelsize(36);
    box->labeltype(FL_SHADOW_LABEL);
    window->end();
    window->show(argc, argv);
    return Fl::run();
}

I can generate but can’t build this, as it says it can’t find the FL headers.
I understand I can try to set the headers manually in project properties but even then it doesn’t seem to be linking the library properly.
A vcpkg list says no packages are installed, I can also run vcpkg install instead of through cmake then vcpkg list shows me stuff. But obviously CMake places the
“vcpkg_installed” folder within my root/build/ folder. And I’ve checked that the headers and libraries are there.

How can I get the IDE to actually find the headers and link properly after configuring and then trying to build? Isn’t this meant to be automatically found when I configure and build. Also I’m not sure if manifest mode is enabled (when doing the cmake configure to get dependencies) as I can’t seem to find the location on VS2022, everything I try follow has VS2019 and they set it through Project Properties -> vcpkg and enable it there but I can’t find anything of the sort on 2022.

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