From af50d389c5ceaf978182c8d783a4d0e76c56655f Mon Sep 17 00:00:00 2001
From: Leo Famulari <leo@famulari.name>
Date: Tue, 7 Mar 2017 22:38:35 -0500
Subject: gnu: grub: Fix build failure with recent flex.

* gnu/packages/bootloaders.scm (grub)[native-inputs]: Use flex-2.6.1.
---
 gnu/packages/bootloaders.scm | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/gnu/packages/bootloaders.scm b/gnu/packages/bootloaders.scm
index 16cb7b4c0b..86a776910a 100644
--- a/gnu/packages/bootloaders.scm
+++ b/gnu/packages/bootloaders.scm
@@ -27,7 +27,6 @@
   #:use-module (gnu packages admin)
   #:use-module ((gnu packages algebra) #:select (bc))
   #:use-module (gnu packages assembly)
-  #:use-module (gnu packages flex)
   #:use-module (gnu packages disk)
   #:use-module (gnu packages bison)
   #:use-module (gnu packages cdrom)
@@ -115,7 +114,10 @@
     (native-inputs
      `(("unifont" ,unifont)
        ("bison" ,bison)
-       ("flex" ,flex)
+       ;; Due to a bug in flex >= 2.6.2, GRUB must be built with an older flex:
+       ;; <http://lists.gnu.org/archive/html/grub-devel/2017-02/msg00133.html>
+       ;; TODO Try building with flex > 2.6.3.
+       ("flex" ,flex-2.6.1)
        ("texinfo" ,texinfo)
        ("help2man" ,help2man)
 
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