From cc938cf22860bcc06635e17ac23a0095f1e36b04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jos=C3=A9=20=C3=81ngel=20Pastrana?=
 <BeardOverflow@users.noreply.github.com>
Date: Sun, 24 Aug 2025 23:27:49 +0200
Subject: [PATCH] Fix kernel version check for TCP_FASTOPEN support

---
 configure.ac | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/configure.ac b/configure.ac
index 66b8e757..e02691b5 100644
--- a/configure.ac
+++ b/configure.ac
@@ -149,14 +149,12 @@ AC_ARG_ENABLE([fastopen],
 AC_MSG_RESULT([$fastopen])
 
 is_fastopen_supported=no;
-if test x"$fastopen" = x"yes"; then
-    if test x"$is_windows" = x"no"; then
-        if test `uname -r |cut -d. -f1` -ge 3; then
-            if test `uname -r |cut -d. -f2` -ge 7; then
-                CXXFLAGS="-DUSE_FASTOPEN $CXXFLAGS";
-                is_fastopen_supported=yes;
-            fi
-        fi
+if test x"$fastopen" = x"yes" && test x"$is_windows" = x"no"; then
+    major=`uname -r | cut -d. -f1`
+    minor=`uname -r | cut -d. -f2`
+    if test "$major" -ge 4 || { test "$major" -eq 3 && test "$minor" -ge 7; }; then
+            CXXFLAGS="-DUSE_FASTOPEN $CXXFLAGS";
+            is_fastopen_supported=yes;
     fi
 fi