vcpkg cmake integration file doesn't resolve dependency

Question

I'm trying to build a program that has dependency on Eigen3 and SDL2.
I'm getting error while using cmake generator command.

Visual Studio 17 2022 is the default generator on my PC. I've checked this with cmake --help command.

C:\vcpkg\scripts\buildsystems\vcpkg.cmake is the location of my vcpkg cmake intergeration file is located.

I've installed bith Eigen3 and SDL2 dependency via vcpkg.

Build Command

cmake .. -DCMAKE_TOOLCHAIN_FILE=C:\vcpkg\scripts\buildsystems\vcpkg.cmake

cmake .. "-DCMAKE_TOOLCHAIN_FILE=C:\vcpkg\scripts\buildsystems\vcpkg.cmake"

cmake ..

I even tried

cmake .. "-DCMAKE_PREFIX_PATH=C:\vcpkg\installed\x64-windows\include\eigen3"

Error

CMake Error at CMakeLists.txt:6 (find_package):
  Could not find a package configuration file provided by "Eigen3" (requested
  version 3.3) with any of the following names:

    Eigen3Config.cmake
    eigen3-config.cmake

  Add the installation prefix of "Eigen3" to CMAKE_PREFIX_PATH or set
  "Eigen3_DIR" to a directory containing one of the above files.  If "Eigen3"
  provides a separate development package or SDK, be sure it has been
  installed.


-- Configuring incomplete, errors occurred!

CMake File

cmake_minimum_required(VERSION 3.5) project(AKFSFSimulation)

set(CMAKE_CXX_STANDARD 11)

find_package (Eigen3 3.3 REQUIRED NO_MODULE)

set(SRC_CPP
    src/main.cpp
    src/display.cpp
    src/beacons.cpp
    src/sensors.cpp
    src/simulation.cpp
    src/utils.cpp
    src/kalmanfilter.cpp )

add_executable(${PROJECT_NAME}
        ${SRC_CPP}
        )

target_link_libraries(${PROJECT_NAME}
        SDL2
        SDL2_ttf
        Eigen3::Eigen
        )

add_custom_command(TARGET ${PROJECT_NAME} PRE_BUILD
    COMMAND ${CMAKE_COMMAND} -E copy_directory
    ${CMAKE_SOURCE_DIR}/data/ $<TARGET_FILE_DIR:${PROJECT_NAME}>)

Eigen Installation

λ .\vcpkg.exe install eigen3 Computing installation plan... The following packages are already installed:
    eigen3:x64-windows -> 3.4.0#2 eigen3:x64-windows is already installed Total install time: 491 us eigen3 provides CMake targets:

    # this is heuristically generated, and may not be correct
    find_package(Eigen3 CONFIG REQUIRED)
    target_link_libraries(main PRIVATE Eigen3::Eigen)

---

Eigen3 Installation Output

λ .\vcpkg.exe install eigen3
Computing installation plan...
The following packages are already installed:
    eigen3:x64-windows -> 3.4.0#2
eigen3:x64-windows is already installed
Total install time: 344 us
eigen3 provides CMake targets:

    # this is heuristically generated, and may not be correct
    find_package(Eigen3 CONFIG REQUIRED)
    target_link_libraries(main PRIVATE Eigen3::Eigen)

Answer 1

Eigen3Config.cmake is located in the folder C:\vcpkg\installed\x64-windows\share\eigen3.
Setting Eigen3_DIR to <vcpkg-root>/installed/x64-windows/share/eigen3 solved the issue.
e.g. Set Eigen3_DIR to c:/vcpkg/installed/x64-windows/share/eigen3 in my case.