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-rw-r--r--gnu/packages/maths.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/packages/maths.scm b/gnu/packages/maths.scm
index 166926da15..ec8316b5f5 100644
--- a/gnu/packages/maths.scm
+++ b/gnu/packages/maths.scm
@@ -1799,7 +1799,7 @@ implemented in ANSI C, and MPI for communications.")
     (build-system gnu-build-system)
     (inputs
      `(("zlib" ,zlib)
-       ("flex" ,flex)
+       ("flex" ,flex-2.6.1) ; A bug in flex prevents building with flex-2.6.3.
        ("bison" ,bison)))
     (arguments
      `(#:phases