[Octave-bug-tracker] [bug #34725] Something regarding Lex causes build failure on OpenBSD

[John W. Eaton]

Follow-up Comment #1, bug #34725 (project octave):

Flex 2.5.35 should work (that is much newer than 2.5.4, so yes, the #error
line in lex.ll should probably be updated).

Flex can generate code that can be compiled with a C++ compiler.

If you are building using sources freshly extracted from a tarball release,
then you should already have lex.cc and you should not need flex unless you
need to modify lex.ll.

If you deleted the generated lex.cc file that is distributed in the Octave
sources, then recreated it with the OpenBSD flex, then I think that could
cause the trouble you are seeing.

Try deleting the lex.cc file and recreating it with flex 2.5.35 or using the
version of the file that is distributed with Octave.

If you still have trouble, then post the command that Make is executing to
generate lex.cc from lex.ll.

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