Eric Gourgoulhon wrote:
> Hi,
> 
> Le vendredi 2 septembre 2016 20:24:27 UTC+2, leif a écrit :
> 
> 
>     Anyone else ever seen this (when building from scratch)?
> 
> 
> I had exactly the same issue when building from scratch on Ubuntu 16.04,
> as reported in
> https://groups.google.com/d/msg/sage-release/MhAwPVWfK28/yu4AvOfTBgAJ
> Reading Vincent's answer, I fixed it by installing the Ubuntu package
> python-pip (build + doctest went fine then).
> But I guess it is better to use sage pip as you propose in #21403.

Well, pip hasn't been (and still isn't) a formal prerequisite for
building Sage, but meanwhile a standard package of Sage, unlike Python*.

We may use a system version (and not build Sage's) in the long run, but
that requires tweaking Sage's top-level 'configure' (and the parts of
the build system it generates).


-leif

____________
* Incidentally I also just "fixed" sage-spkg w.r.t. (still) requiring
*Sage's* python to be already installed just because some package
happens to have a Python /install script/, like for example ATLAS.  This
is kind of the opposite case of the original issue.

After in addition removing (Sage's) python from ATLAS' dependencies, it
(and hence everything that depends on it) now gets built *far* earlier,
namely as (one of) the first package(s) [besides the "toolchain" parts
it doesn't require either unless one is also building Sage's GCC].

I had to make a couple of changes to Sage's install scripts for ATLAS in
order to let it build with (a system) python 2.6, the (inofficial?)
minimum version we require to build Sage, as well, but now it works.
Not sure whether there are other packages where we could do the same (or
similar).

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