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-rw-r--r--gnu/packages/bootloaders.scm5
1 files changed, 4 insertions, 1 deletions
diff --git a/gnu/packages/bootloaders.scm b/gnu/packages/bootloaders.scm
index 2d8d89f754..76dad2923e 100644
--- a/gnu/packages/bootloaders.scm
+++ b/gnu/packages/bootloaders.scm
@@ -118,7 +118,10 @@
     (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 > 2.6.4.
+       ("flex" ,flex-2.6.1)
        ("texinfo" ,texinfo)
        ("help2man" ,help2man)