SAGE_SPKG_CONFIGURE(
    [sage_brial], [dnl direct testing of file existence, import do not work without sage
      AC_MSG_CHECKING(py-brial installation...)
      if [[ -f %%PYTHON_SITELIBDIR%%/brial/cnf.py ]] ; then
        AC_MSG_RESULT(OK)
      else
        AC_MSG_RESULT(KO)
        sage_spkg_install_sage_brial=yes
      fi
])