> You could also try
> 
>    sage -ba
> 
> which will rebuild from scratch all Cython code.

OK I will give it a go.

> If you have an SMP machine, do
>    export MAKE="make -j10"
> , where 10 is the number of cores, first.  For example, on
> sage.math.washington.edu, I
> do "make -j24" and can build the whole Sage library (with "sage -ba")
> in < 5 minutes.
Nice - not really useful for my late 2003 single CPU home machine but nice
to know. 
Although usually the rule of thumb is (number of cores)+1.

Francois

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