The configure script is looking for flex >= 2.5 and <= 2.6. Newer
versions of flex (2.6.x) fail while checking for the subversion:
LEX_SUBVERSION=`echo "$LEX_VERSION" | sed -e 's/^2.5.//'`
This results in the following output from the configure script and
broken syntax filters (undefined symbol):
checking version of flex... 2.6.0
./configure: line 5316: test: 2.6.0: integer expression expected
--
Michael Wagner
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