cmake_minimum_required(VERSION 3.0 FATAL_ERROR)

find_library(EIGENLIB_FOUND eigenlib)

if(NOT EIGENLIB_FOUND MATCHES "NOTFOUND")
  set(HAVE_EIGENLIB_ON_SYSTEM 1 PARENT_SCOPE)
else(NOT EIGENLIB_FOUND MATCHES "NOTFOUND")
  set(HAVE_EIGENLIB_ON_SYSTEM 0 PARENT_SCOPE)
  add_subdirectory(Eigen)
endif(NOT EIGENLIB_FOUND MATCHES "NOTFOUND")