diff --git a/package/bootgen/0001-bisonflex-Fix-build-on-machines-with-modern-flex.patch b/package/bootgen/0001-bisonflex-Fix-build-on-machines-with-modern-flex.patch
new file mode 100644
index 0000000000..6d048e9bd9
--- /dev/null
+++ b/package/bootgen/0001-bisonflex-Fix-build-on-machines-with-modern-flex.patch
@@ -0,0 +1,72 @@
+From e7e341b7ba6fa9fb875718e8740b03c2041278e8 Mon Sep 17 00:00:00 2001
+From: Neal Frager <neal.frager@amd.com>
+Date: Mon, 2 Jun 2025 12:09:13 +0100
+Subject: [PATCH] bisonflex: Fix build on machines with modern flex
+
+With bootgen 2025.1, the directory structure was re-done.  In the process of
+doing this, the source files in the bisonflex directory lost the fix below
+which had been applied on an earlier version of bootgen:
+
+Bootgen embeds an old version of flex, but uses the system include syntax
+(#include <>) to reference it, causing conflicts on systems with the
+development headers for a modern flex version installed, leading to build
+issues like:
+
+../bisonflex/bif.yy.cpp: In member function 'virtual int BIF::FlexScanner::yylex()':
+../bisonflex/bif.yy.cpp:1608:18: error: no match for 'operator=' (operand types are 'std::istream' {aka 'std::basic_istream'} and 'std::istream*' {aka 'std::basic_istream*'})
+
+Fix it by using normal local #include statements by:
+
+sed -i 's/<FlexLexer.h>/"FlexLexer.h"/g' *
+
+Upstream: submitted to AMD internal jira process
+
+Signed-off-by: Neal Frager <neal.frager@amd.com>
+---
+ bisonflex/bif.yy.cpp        | 2 +-
+ bisonflex/cmdoptions.yy.cpp | 2 +-
+ bisonflex/reginit.yy.cpp    | 2 +-
+ 3 files changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/bisonflex/bif.yy.cpp b/bisonflex/bif.yy.cpp
+index 8d4d364..35f0aa5 100755
+--- a/bisonflex/bif.yy.cpp
++++ b/bisonflex/bif.yy.cpp
+@@ -379,7 +379,7 @@ typedef unsigned char YY_CHAR;
+ 
+ #define yytext_ptr yytext
+ 
+-#include <FlexLexer.h>
++#include "FlexLexer.h"
+ 
+ int yyFlexLexer::yywrap() { return 1; }
+ int yyFlexLexer::yylex()
+diff --git a/bisonflex/cmdoptions.yy.cpp b/bisonflex/cmdoptions.yy.cpp
+index 661d7f3..a76ac81 100755
+--- a/bisonflex/cmdoptions.yy.cpp
++++ b/bisonflex/cmdoptions.yy.cpp
+@@ -379,7 +379,7 @@ typedef unsigned char YY_CHAR;
+ 
+ #define yytext_ptr yytext
+ 
+-#include <FlexLexer.h>
++#include "FlexLexer.h"
+ 
+ int yyFlexLexer::yywrap() { return 1; }
+ int yyFlexLexer::yylex()
+diff --git a/bisonflex/reginit.yy.cpp b/bisonflex/reginit.yy.cpp
+index d830734..dede473 100755
+--- a/bisonflex/reginit.yy.cpp
++++ b/bisonflex/reginit.yy.cpp
+@@ -379,7 +379,7 @@ typedef unsigned char YY_CHAR;
+ 
+ #define yytext_ptr yytext
+ 
+-#include <FlexLexer.h>
++#include "FlexLexer.h"
+ 
+ int yyFlexLexer::yywrap() { return 1; }
+ int yyFlexLexer::yylex()
+-- 
+2.25.1
+