###############################################################################
# Find Eigen3
#
# This sets the following variables:
# EIGEN_FOUND - True if Eigen was found.
# EIGEN_INCLUDE_DIRS - Directories containing the Eigen include files.
# EIGEN_DEFINITIONS - Compiler flags for Eigen.

find_package(PkgConfig QUIET)
pkg_check_modules(PC_EIGEN eigen3)
set(EIGEN_DEFINITIONS ${PC_EIGEN_CFLAGS_OTHER})

find_path(EIGEN_INCLUDE_DIR Eigen/Core
    HINTS ${PC_EIGEN_INCLUDEDIR} ${PC_EIGEN_INCLUDE_DIRS} "${EIGEN_ROOT}" "$ENV{EIGEN_ROOT}"
    PATHS "$ENV{PROGRAMFILES}/Eigen" "$ENV{PROGRAMW6432}/Eigen"
          "$ENV{PROGRAMFILES}/Eigen 3.0.0" "$ENV{PROGRAMW6432}/Eigen 3.0.0"
    PATH_SUFFIXES eigen3 include/eigen3 include)

set(EIGEN_INCLUDE_DIRS ${EIGEN_INCLUDE_DIR})

include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(Eigen DEFAULT_MSG EIGEN_INCLUDE_DIR)

mark_as_advanced(EIGEN_INCLUDE_DIR)

if(EIGEN_FOUND)
  message(STATUS "Eigen found (include: ${EIGEN_INCLUDE_DIRS})")
endif(EIGEN_FOUND)