# construct dependencies search path
if (ANDROID)
  set(EIGEN3_DEPENDENCIES_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/android/${ANDROID_ABI}" CACHE PATH "EIGEN3 SDK path" FORCE)
elseif(WIN64)
  set(EIGEN3_DEPENDENCIES_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/windows/x64" CACHE PATH "EIGEN3 SDK path" FORCE)
elseif(WIN32)
  set(EIGEN3_DEPENDENCIES_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/windows/x86" CACHE PATH "EIGEN3 SDK path" FORCE)
elseif(APPLE AND NOT IOS)
  set(EIGEN3_DEPENDENCIES_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/apple/OSX" CACHE PATH "EIGEN3 SDK path" FORCE)
elseif(APPLE AND IOS)
  set(EIGEN3_DEPENDENCIES_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/apple/IOS" CACHE PATH "EIGEN3 SDK path" FORCE)
elseif(SCOL_INSTALL_PREFIX)
  set(EIGEN3_DEPENDENCIES_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/${SCOL_INSTALL_PREFIX}" CACHE PATH "EIGEN3 SDK path" FORCE)
else(LINUX)
  set(EIGEN3_DEPENDENCIES_DIR "$ENV{SCOL_DEPENDENCIES_PATH}/sdk/linux" CACHE PATH "EIGEN3 SDK path" FORCE)
endif()

find_path(EIGEN3_INCLUDE_DIR NAMES signature_of_eigen3_matrix_library
    HINTS
    ENV EIGEN3_ROOT 
    ENV EIGEN3_ROOT_DIR
    PATHS
    ${EIGEN3_DEPENDENCIES_DIR}/include
    ${CMAKE_INSTALL_PREFIX}/include
    PATH_SUFFIXES eigen3 eigen
  )

if (EIGEN3_INCLUDE_DIR)
  set(EIGEN3_FOUND TRUE)
endif(EIGEN3_INCLUDE_DIR)