Finally I solved the problem:

I had flex 2.5.37 installed locally (I have no admin rights)
but the command 'lex' was still linked to the old flex 2.5.31 version.

So I was using way too old versions of flex and bison and there is no bug in automake.
Although it would be helpful if configure would check the bison and flex version and give a warning for too old versions.


Thanks for the help,
Johannes






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