Hi,

On Mon, Jul 04, 2016 at 02:14:20PM +1200, François Bissey wrote:
> So I have been inspecting giac, as any discussion of making something
> a standard package as an impact for sage-on-gentoo.
> We have an old version in the science overlay so I am working on
> upgrading it.
> 
> 1) current 1.2.2-63 and a few earlier versions need the gui, compiling
> with "--disable-gui" is broken.

If there is a choice there, i would vote for having the gui compiled by
default, and have a 'sage -giac' and/or 'sage -xcas' commands available.

Ciao,
Thierry


> 2) the dependency on libao was making me curious so I investigated.
> It is an "automagic" dependency. There is a line
> AC_CHECK_LIB(ao, main)
> in configure.in and the library can be used in src/maple.cc.
> What this means is that if you build sage binary on a machine that
> has libao, giac will be broken when the binary is installed on
> machines without it. So this has to be fixed when giac becomes
> standard.
> 3) lapack can be used but detection is strange and it could lead to
> similar pitfalls than libao if the right files are present on the build
> system. It currently cannot pick up sage's lapack. It is a default
> configure option.
> 
> I haven't gone through giacpy yet, but I don't like the fact there
> is a sage specific version. Something could be done to only have one
> source if my understanding of the issues and solution are correct.
> 
> Francois
> 
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