diff --git a/gmp-impl.h b/gmp-impl.h
index 4f6ed23f..d36e8a70 100644
--- a/gmp-impl.h
+++ b/gmp-impl.h
@@ -3413,9 +3413,21 @@ mpn_ngcd_subdiv_step (mp_ptr gp, mp_size_t *gn,
 mp_size_t
 mpn_ngcd_lehmer (mp_ptr gp, mp_ptr ap, mp_ptr bp, mp_size_t n, mp_ptr tp);
 
+mp_size_t
+mpn_ngcd (mp_ptr gp, mp_ptr ap, mp_size_t an, mp_ptr bp, mp_size_t n);
+
 mp_size_t
 mpn_lgcd (mp_ptr gp, mp_ptr ap, mp_size_t an, mp_ptr bp, mp_size_t bn);
 
+mp_size_t
+mpn_rgcd (mp_ptr gp, mp_ptr up, mp_size_t usize, mp_ptr vp, mp_size_t vsize);
+
+mp_size_t
+mpn_sgcd (mp_ptr gp, mp_ptr ap, mp_size_t an, mp_ptr bp, mp_size_t bn);
+
+mp_size_t
+mpn_bgcd (mp_ptr gp, mp_ptr ap, mp_size_t an, mp_ptr bp, mp_size_t bn);
+
 /* Default HGCD_SCHOENHAGE_THRESHOLD and GCD_SCHOENHAGE_THRESHOLD are for x86/k7 */
 #ifndef HGCD_SCHOENHAGE_THRESHOLD
 #define HGCD_SCHOENHAGE_THRESHOLD 191