01/02: gnu: Add flex-2.6.1.

[Leo Famulari]

lfam pushed a commit to branch core-updates
in repository guix.

commit aac67f210df820e84cdd380dc061e417ebd2154e
Author: Leo Famulari <address@hidden>
Date:   Tue Mar 7 22:37:58 2017 -0500

    gnu: Add flex-2.6.1.
    
    * gnu/packages/flex.scm (flex-2.6.1): New variable.
---
 gnu/packages/flex.scm | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/gnu/packages/flex.scm b/gnu/packages/flex.scm
index 2d31660..1470b96 100644
--- a/gnu/packages/flex.scm
+++ b/gnu/packages/flex.scm
@@ -85,3 +85,20 @@ regular expressions for each rule.  Whenever it finds a 
match, it
 executes the corresponding C code.")
     (license (non-copyleft "file://COPYING"
                            "See COPYING in the distribution."))))
+
+;;; Many packages fail to build with flex > 2.6.1, due to this bug in flex:
+;;; <https://github.com/westes/flex/issues/162>
+;;; We must not use a flex before 2.6.1, due to CVE-2016-6354.
+;;; TODO Try using flex > 2.6.3.
+(define-public flex-2.6.1
+  (package
+    (inherit flex)
+    (version "2.6.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://github.com/westes/flex";
+                                  "/releases/download/v" version "/"
+                                  "flex-" version ".tar.xz"))
+             (sha256
+              (base32
+               "0gqhk4vkwy4gl9xbpgkljph8c0a5kpijz6wd0p5r9q202qn42yic"))))))