diff --git a/packages/devel/flex/package.mk b/packages/devel/flex/package.mk
index 707b104c23..a0981746a7 100644
--- a/packages/devel/flex/package.mk
+++ b/packages/devel/flex/package.mk
@@ -3,11 +3,11 @@
 # Copyright (C) 2019-present Team LibreELEC (https://libreelec.tv)
 
 PKG_NAME="flex"
-PKG_VERSION="2.6.0"
-PKG_SHA256="24e611ef5a4703a191012f80c1027dc9d12555183ce0ecd46f3636e587e9b8e9"
+PKG_VERSION="2.6.4"
+PKG_SHA256="e87aae032bf07c26f85ac0ed3250998c37621d95f8bd748b31f15b33c45ee995"
 PKG_LICENSE="GPL"
-PKG_SITE="http://flex.sourceforge.net/"
-PKG_URL="$SOURCEFORGE_SRC/flex/$PKG_NAME-$PKG_VERSION.tar.bz2"
+PKG_SITE="https://github.com/westes/flex"
+PKG_URL="https://github.com/westes/flex/releases/download/v$PKG_VERSION/$PKG_NAME-$PKG_VERSION.tar.gz"
 PKG_DEPENDS_HOST="ccache:host m4:host autotools:host bison:host"
 PKG_DEPENDS_TARGET="toolchain"
 PKG_LONGDESC="A tool for generating programs that perform pattern-matching on text."
diff --git a/packages/devel/flex/patches/c5a26b17a2b091c560f6c4e6703e55f496bf74fa.patch b/packages/devel/flex/patches/c5a26b17a2b091c560f6c4e6703e55f496bf74fa.patch
new file mode 100644
index 0000000000..22592df348
--- /dev/null
+++ b/packages/devel/flex/patches/c5a26b17a2b091c560f6c4e6703e55f496bf74fa.patch
@@ -0,0 +1,28 @@
+From c5a26b17a2b091c560f6c4e6703e55f496bf74fa Mon Sep 17 00:00:00 2001
+From: Explorer09 <explorer09@gmail.com>
+Date: Mon, 4 Sep 2017 10:47:33 +0800
+Subject: [PATCH] AC_USE_SYSTEM_EXTENSIONS in configure.ac
+
+This would define _GNU_SOURCE in config.h, enabling the reallocarray()
+prototype in glibc 2.26+.
+
+Fixes #241.
+---
+ configure.ac | 2 ++
+ 1 file changed, 2 insertions(+)
+
+diff --git a/configure.ac b/configure.ac
+index c6f12d64..3c977a4e 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -25,8 +25,10 @@
+ # autoconf requirements and initialization
+ 
+ AC_INIT([the fast lexical analyser generator],[2.6.4],[flex-help@lists.sourceforge.net],[flex])
++AC_PREREQ([2.60])
+ AC_CONFIG_SRCDIR([src/scan.l])
+ AC_CONFIG_AUX_DIR([build-aux])
++AC_USE_SYSTEM_EXTENSIONS
+ LT_INIT
+ AM_INIT_AUTOMAKE([1.15 -Wno-portability foreign std-options dist-lzip parallel-tests subdir-objects])
+ AC_CONFIG_HEADER([src/config.h])
diff --git a/packages/devel/flex/patches/flex-001-plex.malloc.patch b/packages/devel/flex/patches/flex-001-plex.malloc.patch
deleted file mode 100644
index 54422ab7b5..0000000000
--- a/packages/devel/flex/patches/flex-001-plex.malloc.patch
+++ /dev/null
@@ -1,15 +0,0 @@
---- a/configure.ac	2015-02-10 15:21:25.466408144 +0100
-+++ b/configure.ac.new	2015-02-10 15:21:08.070408144 +0100
-@@ -106,9 +106,9 @@
- 
- AC_FUNC_ALLOCA
- AC_FUNC_FORK
--AC_FUNC_MALLOC
--AC_FUNC_REALLOC
--AC_CHECK_FUNCS([dup2 isascii memset pow regcomp setlocale strchr strtol])
-+# AC_FUNC_MALLOC
-+# AC_FUNC_REALLOC
-+AC_CHECK_FUNCS([malloc realloc dup2 isascii memset pow regcomp setlocale strchr strtol])
- 
- AC_CONFIG_FILES(
- Makefile