[bug #50093] Build failure with flex 2.6.3

[felix]

URL:
  <http://savannah.gnu.org/bugs/?50093>

                 Summary: Build failure with flex 2.6.3
                 Project: GNU GRUB
            Submitted by: felix_s
            Submitted on: Thu 19 Jan 2017 12:16:21 PM GMT
                Category: Compilation
                Severity: Major
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 
                 Release: Git master
         Reproducibility: Every Time
         Planned Release: None

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Details:

Building GRUB with flex 2.6.3 generates an error message about macros yyalloc,
yyfree and yyrealloc being redefined.

Adding #undefs in yylex.l fixes it.




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