DECLARE_SCHEME_CALLBACK (calc_normal_stems, (SCM));
DECLARE_SCHEME_CALLBACK (calc_concaveness, (SCM));
DECLARE_SCHEME_CALLBACK (set_stem_lengths, (SCM));
DECLARE_SCHEME_CALLBACK (calc_normal_stems, (SCM));
DECLARE_SCHEME_CALLBACK (calc_concaveness, (SCM));
DECLARE_SCHEME_CALLBACK (set_stem_lengths, (SCM));