function(find_xxxpack libname libpack libdir is_pack_found reslib)
  set(pack_found FALSE)
  if (NOT ${libdir} STREQUAL " ")
    find_library(pack_lib NAMES ${libpack} PATHS ${libdir} NO_DEFAULT_PATH)
    if (pack_lib)
      set(pack_found TRUE)
    endif()
  endif()
  if (NOT pack_found)
    find_library(pack_lib NAMES ${libpack} PATHS ${libdir} ${LIB_INSTALL_DIR} PATH_SUFFIXES lib Lib)
    if (pack_lib)
      set(pack_found TRUE)
    endif()
  endif()
  if (pack_found)
    if (NOT pack_lib_FIND_QUIETLY)
      message(STATUS "Found ${libname} : ${pack_lib}")
      get_filename_component(pack_path ${pack_lib} PATH CACHE)
      set(pack_include_dir ${pack_path}/../include CACHE FILEPATH ${libname} " include directory.")
    endif()
  else()
    message(STATUS "Could not find ${libname}")
  endif()
  set(${is_pack_found} ${pack_found} PARENT_SCOPE)
  set(${reslib} ${pack_lib} PARENT_SCOPE)
  unset(pack_lib CACHE)
  unset(pack_path CACHE)
endfunction(find_xxxpack)

function(find_arpack libdir arpack_found reslib)
  find_xxxpack(ARPACK arpack ${libdir} is_found arpack_lib)
  set(${arpack_found} ${is_found} PARENT_SCOPE)
  set(${reslib} ${arpack_lib} PARENT_SCOPE)
endfunction(find_arpack)

function(find_lapack libdir lapack_found reslib)
  find_xxxpack(LAPACK lapack ${libdir} is_found lapack_lib)
  set(${lapack_found} ${is_found} PARENT_SCOPE)
  set(${reslib} ${lapack_lib} PARENT_SCOPE)
endfunction(find_lapack)

function(find_blas libdir blas_found reslib)
  find_xxxpack(BLAS blas ${libdir} is_found blas_lib)
  set(${blas_found} ${is_found} PARENT_SCOPE)
  set(${reslib} ${blas_lib} PARENT_SCOPE)
endfunction(find_blas)

function(find_openblas libdir blas_found reslib)
  find_xxxpack(OPENBLAS openblas ${libdir} is_found blas_lib)
  set(${blas_found} ${is_found} PARENT_SCOPE)
  set(${reslib} ${blas_lib} PARENT_SCOPE)
endfunction(find_openblas)