> The "offending" lines look like this :

> #OPERA_LD_PRELOAD="${LD_PRELOAD}"
> #export OPERA_LD_PRELOAD

> Stange enough, this seems to both setenv OPERA_LD_PRELOAD and
> LD_PRELOAD to (nil), that is to say "" or (char *) 0 :)

First, those lines are comments, so they shouldn't set anything to
anything.  Second, "" and (char *)0 are not at all the same thing - the
former is[%] a pointer to a byte containing zero; the latter is a nil
pointer-to-char, a pointer that does not point to anything.

[%] Strictly speaking, it's array[1] of char, initialized to {0}, which
    in most contexts decays to the pointer I describe.

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