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-rw-r--r--stdlib/integers.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/stdlib/integers.h b/stdlib/integers.h
index 3bc3abeb..e0586882 100644
--- a/stdlib/integers.h
+++ b/stdlib/integers.h
@@ -142,7 +142,11 @@ Int_t Int$slow_negative(Int_t x);
Int_t Int$slow_negated(Int_t x);
bool Int$is_prime(Int_t x, Int_t reps);
Int_t Int$next_prime(Int_t x);
+#if __GNU_MP_VERSION >= 6
+#if __GNU_MP_VERSION_MINOR >= 3
Int_t Int$prev_prime(Int_t x);
+#endif
+#endif
Int_t Int$choose(Int_t n, Int_t k);
Int_t Int$factorial(Int_t n);