I have a cmake project where I’m using vcpkg as a package manager. One of the dependencies I need is the apriltag dependency which is dependent on the pthread dependency.

the project seems to configure and download the dependencies perfectly fine. Here is a copy of the cmake output for the configuration:

https://drive.google.com/file/d/12G5uv961qeyBKJxFHSum0nsozbCDc4R8/view?usp=sharing

but when I try to build the project, I get many errors, which can be viewed here:
https://drive.google.com/file/d/1vbU6LfpeoIcY0F1X_WHGGM4BKno3Rths/view?usp=sharing

I am currently developing on windows 10:

gcc (Rev3, Built by MSYS2 project) 13.2.0

cmake version 3.30.0-rc4

vcpkg package management program version 2024-07-10-d2dfc73769081bdd9b782d08d27794780b7a99b9

this is my CMakeLists.txt file:

cmake_minimum_required(VERSION 3.10)

set(CMAKE_TOOLCHAIN_FILE "$ENV{VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake")

project(WPIcal)

set(OSBitness 64)
if(CMAKE_SIZEOF_VOID_P EQUAL 4)
    set(OSBitness 32)
endif()

set(FullOutputDir "${CMAKE_SOURCE_DIR}/bin/${CMAKE_SYSTEM_NAME}${OSBitness}/${CMAKE_BUILD_TYPE}")
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY "${FullOutputDir}")
set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${FullOutputDir}")

find_package(OpenCV CONFIG REQUIRED)
find_package(apriltag CONFIG REQUIRED)
find_package(ceres CONFIG REQUIRED)
find_package(Eigen3 CONFIG REQUIRED)
find_package(nlohmann_json CONFIG REQUIRED)

add_executable(
    ${PROJECT_NAME}
    src/cpp/main.cpp
)

target_include_directories(${PROJECT_NAME} PRIVATE
    ${CMAKE_SOURCE_DIR}/src/include
    ${CMAKE_SOURCE_DIR}/wpigui/src/include
)

target_link_libraries(${PROJECT_NAME} PRIVATE
    opencv_core
    opencv_imgproc
    opencv_highgui
    opencv_video
    opencv_videoio
    Ceres::ceres
    Eigen3::Eigen
    nlohmann_json::nlohmann_json
    apriltag::apriltag
)

this is my vcpkg.json file:

{
  "dependencies": [
    "apriltag",
    {
      "name": "ceres",
      "features": [
        "eigensparse"
      ]
    },
    {
      "name": "opencv4",
      "features": [
        "ffmpeg",
        "contrib"
      ]
    },
    "eigen3",
    "nlohmann-json",
    "glfw3",
    "imgui"
  ]
}

and this is my file structure:

wpical
├── CMakeLists.txt
├── error.txt
├── src
│   ├── cpp
│   │   ├── cameracalibration.cpp
│   │   ├── fieldcalibration.cpp
│   │   └── main.cpp
│   └── include
│       ├── cameracalibration.h
│       └── fieldcalibration.h
├── vcpkg.json
└── wpigui
    └── src
        ├── cpp
        │   ├── portable-file-dialogs.cpp
        │   ├── wpigui.cpp
        │   ├── wpigui_directx11.cpp
        │   ├── wpigui_metal.mm
        │   ├── wpigui_opengl2.cpp
        │   ├── wpigui_opengl3.cpp
        │   └── wpigui_openurl.cpp
        └── include
            ├── portable-file-dialogs.h
            ├── wpigui.h
            ├── wpigui_internal.h
            └── wpigui_openurl.h

So far, I’ve updated msys2, vcpkg, and cmake, but the error still persists.

The really weird thing is that this project builds perfectly fine in a gradle environment, with no build errors about conflicting declarations.

I appreciate any insight on the issue, thanks so much!