Hello, sir:

I download deal.ii-6.0.0.tar.gz uncompressed it and run the following
commands:

./configure
make base lac

and then the following error comes up:

In file included from source/conditional_ostream.cc:14:0:
/home/alex/deal.II/base/include/base/conditional_ostream.h:155:28: error:
reference ‘output_stream’ cannot be declared ‘mutable’ [-fpermissive]
make[1]: *** [/home/alex/deal.II/lib/base/conditional_ostream.g.o] Error 1
make[1]: Leaving directory `/home/alex/deal.II/base'
make: *** [baseg] Error 2

Then I try to google to solving it, and found it maybe the problem of gcc4.6
and then I run the following commands:

CC=gcc-4.3 ./configure
make base lac

but anyway, the same error show up?

how can i fix it?
Thanks a lot
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