[sr #110211] flex fails with autoconf master

[Ross Burton]

URL:
  <https://savannah.gnu.org/support/?110211>

                 Summary: flex fails with autoconf master
                 Project: Autoconf
            Submitted by: rossburton
            Submitted on: Wed 18 Mar 2020 02:48:09 PM UTC
                Category: None
                Priority: 5 - Normal
                Severity: 3 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
        Operating System: GNU/Linux

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Details:

With autoconf master 8a0900 (~2020-03-18), Flex 2.6.4 is failing like this: 

checking for strtol... yes
./configure: command substitution: line 16785: syntax error near unexpected
token `then'
./configure: command substitution: line 16785: `then :'
./configure: line 16777:  = xyes
then :
  cat >>confdefs.h <<_ACEOF
[pages of configure script] 

There's an upstream patch which fixes this, but that might be more by accident
than design and the regression isn't intentional:

https://github.com/westes/flex/commit/c42de062bbdc7c31d7181c10a74202d493280ada





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