Minor configuration items

[Michael D. Godfrey]

I compiled 3.0.1 release and the current development hg
on my MacBook Pro (10.5.2) laptop and found:

1. It was necessary to install the usual "extras."  The main
    problem with this was that the qhull source does not compile
    correctly (using gcc 4.3) if the default -O2 option is used.
    The result is an immediate seq fault in geom.c
    Removing the option -O2 fixes the problem.

2. With all "extras" installed, 3.0.1 compiles and installs without 
problem. 
    But the default branch dies when building liboctave.dylib with:

    ld: duplicate symbol Array<long long>::Array(Array<long long> const&) in
    pic/Array-so.o and pic/Array-i.o.  

    This happens with gcc 4.3 and with gcc 4.0.

Since the problem above is fixed in 3.0.1, it should not be hard to discover
why it fails in the development branch.  But, if any more information is 
needed
please tell me.  Needless to say, both 3.0.1 and devel compile fine on 
Linux f8.

Michael Godfrey