https://github.com/flintlib/flint/pull/2411

From 9957b17e6b08bd57790f7da1344b4d92eefc0b38 Mon Sep 17 00:00:00 2001
From: Ross Smyth <18294397+RossSmyth@users.noreply.github.com>
Date: Sun, 21 Sep 2025 15:58:57 -0400
Subject: [PATCH] Fix duplicate symbols linker error

When I run `make check` I get linker errors without
this patch
---
 src/double_interval.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/double_interval.h b/src/double_interval.h
index a423257db2..5f685c283f 100644
--- a/src/double_interval.h
+++ b/src/double_interval.h
@@ -13,7 +13,7 @@
 #define DOUBLE_INTERVAL_H
 
 #ifdef DOUBLE_INTERVAL_INLINES_C
-#define DOUBLE_INTERVAL_INLINE
+#define DOUBLE_INTERVAL_INLINE static
 #else
 #define DOUBLE_INTERVAL_INLINE static inline
 #endif