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-rw-r--r--internal.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index 377baa09ee..f33059b985 100644
--- a/internal.h
+++ b/internal.h
@@ -518,6 +518,9 @@ VALUE rb_big_mul_normal(VALUE x, VALUE y);
VALUE rb_big_mul_balance(VALUE x, VALUE y);
VALUE rb_big_mul_karatsuba(VALUE x, VALUE y);
VALUE rb_big_mul_toom3(VALUE x, VALUE y);
+#if defined(HAVE_LIBGMP) && defined(HAVE_GMP_H)
+VALUE rb_big_mul_gmp(VALUE x, VALUE y);
+#endif
VALUE rb_big_sq_fast(VALUE x);
/* file.c */