else()
  find_file(ATLAS_LAPACK liblapack.so.3 PATHS /usr/lib/atlas /usr/lib64/atlas)
  find_library(ATLAS_LAPACK NAMES lapack)
  set(CMAKE_REQUIRED_LIBRARIES ${LAPACK_LIBRARIES} ${ATLAS_CBLAS})
  check_library_exists("${ATLAS_LAPACK}" clapack_dpotrf "" FOUND_CLAPACK)
  if(NOT FOUND_CLAPACK)
    unset(ATLAS_LAPACK CACHE)
  endif()
  unset(CMAKE_REQUIRED_LIBRARIES CACHE)