[m-rev.] for test and review by Peter: fix mantis 391

[Zoltan Somogyi]

Peter, I think this fixes mantis 391, but I can only look at
the generated .opt file; in the absence of the rest of the code
that require_lt.m was derived from, I cannot fully test the fix.
Can you please try out this diff? You may also want to add
a test case for the bug to our test suite.

Zoltan.
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