https://github.com/lavv17/lftp/commit/8af97cc255c3d2488adb107515bd1047dbedadfe

From 8af97cc255c3d2488adb107515bd1047dbedadfe Mon Sep 17 00:00:00 2001
From: DJ Delorie <dj@redhat.com>
Date: Wed, 8 Feb 2023 23:37:37 -0500
Subject: [PATCH] Fix C99 compatibility issue

Related to:

  <https://fedoraproject.org/wiki/Changes/PortingToModernC>
  <https://fedoraproject.org/wiki/Toolchain/PortingToModernC>
--- a/m4/needtrio.m4
+++ b/m4/needtrio.m4
@@ -9,6 +9,7 @@ AC_DEFUN([LFTP_NEED_TRIO],[
       else
 
       AC_RUN_IFELSE([AC_LANG_SOURCE([[
+	 #include <stdio.h>
 	 int main()
 	 {
 	    unsigned long long x=0,x1;