Which version of Sage is this?
We fixed a bug like this recently that showed up when the environment 
variable MAKE was set in a particular way.
See also https://trac.sagemath.org/ticket/33587

On Sunday, April 24, 2022 at 3:17:08 AM UTC-7 list...@gmail.com wrote:

>
> Thanks, Maxime.
>
> Here is what I did.
> Starting from scratch, cloned develop branch, make, make pytest, make 
> ptestlong with no problems.
> New branch with a very minor modification in one file (typo in a doc 
> string).
> So I think this applies:
>
> *Rebuilding Sage*
> Once you have made any changes you of course want to build Sage and try 
> out your edits. As long as you only modified the Sage library (that is, 
> Python and Cython files under src/sage/...) you just have to run:
> ./sage -br
> to rebuild the Sage library and then start Sage. This should be quite 
> fast. If you made changes to third-party packages, then you have to run
> make build
> as if you were installing Sage from scratch.
>
>  Of course make build works, but my question is why ./sage -br fails with
> /bin/sh: @cd: command not found
>
> Guillermo
>
> On Sun, 24 Apr 2022 at 11:30, Maxime Bombar <maxime...@inria.fr> wrote:
>
>> On 4/24/22 00:37, G. M.-S. wrote:
>> >
>> > Following the advice in
>> >
>> > 
>> https://doc.sagemath.org/html/en/developer/walk_through.html#rebuilding-sage
>> >
>> > when trying
>> >
>> > ./sage -br
>> >
>> > I get
>> >
>> > [...]
>> > ***********************************************
>> > /bin/sh: @cd: command not found
>> > make: *** [sagelib-SAGE_VENV-no-deps] Error 127
>> >
>> > real 0m0.029s
>> > user 0m0.024s
>> > sys 0m0.003s
>> > ***************************************************************
>> > Error building Sage.
>> >
>> > The following package(s) may have failed to build (not necessarily
>> > during this run of 'make sagelib-no-deps'):
>> >
>> > It is safe to delete any log files [...]
>> >
>> > What can I do?
>> >
>> > Guillermo
>> >
>> Hi Guillermo,
>>
>> if you have upgraded your system, especially python version, and/or 
>> other Sage dependencies, it might be necessary to rebuild sage from 
>> scratch, with a `make build`.
>>
>> -- 
>> Maxime
>>
>

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