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-rw-r--r--gnu/packages/embedded.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/packages/embedded.scm b/gnu/packages/embedded.scm
index fbbafc6a3b..0e86478bd3 100644
--- a/gnu/packages/embedded.scm
+++ b/gnu/packages/embedded.scm
@@ -764,7 +764,7 @@ simulator.")
                  (base32
                   "14b3h2ji740s8zq5vwm4qdcxs4aa4wxi6wb9di3bv1h39x14nyr9"))))
          ("texinfo" ,texinfo)
-         ("flex" ,flex)
+         ("flex" ,flex-2.6.1) ; A bug in flex prevents building with flex-2.6.3.
          ("bison" ,bison)
          ("guile-1.8" ,guile-1.8)
          ("which" ,base:which)))