On Tuesday, May 26, 2020 at 6:46:48 AM UTC-7, Thierry 
(sage-googlesucks@xxx) wrote:
>
>
> On Mon, May 25, 2020 at 09:51:20PM -0700, Matthias Koeppe wrote: 
> > ./configure --enable-cbc && make 
>
> OK thanks. I notice that if i do 
>
>    ./configure --enable-foo 
>    ./configure --enable-bar 
>    make build 
>
> it seems that only bar is installed, right ? 
>

That's correct.

In standard configure scripts, one would have to do "./configure 
--enable-foo --enable-bar". 
 

> If i want to make a progressive loop over packages, i should iterate 
> like that : 
>
>     for i in <packages list> ; do 
>         /configure --enable-${i} 
>         make build 
>     done 
>
> Correct ? 
>

Yes, that will work for Sage because of a particular feature: Packages that 
are already installed in the prefix are automatically enabled.

In general, to add a configure option, you can always do the following:

  ./configure $(./config.status --config) --enable-bar

Matthias


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