Hi Francois,

thanks for the immediate reply! Checking out the ticket solved the problem 
(at least on my ThinkPad, the others I will try later on)!


Am Sonntag, 11. Februar 2018 21:19:21 UTC+1 schrieb François Bissey:
>
> Hi, 
>
> I am responsible for this bug, it happens when you do an incremental build 
> of sage (i.e. you are upgrading a prior version of sage rather than 
> building 
> from scratch). It doesn’t happen on build from scratch or when you are 
> using 
> compilers from the system. 
> A fix is being reviewed at https://trac.sagemath.org/ticket/24694 
> Note that if you want to try it you’ll need autotools and related packages 
> to 
> be installed. 
>
> François 
>
> > On 12/02/2018, at 07:28, Sebastian Oehms <seb....@gmail.com 
> <javascript:>> wrote: 
> > 
> > Hello, 
> > 
> > since I am new in this fore, let me introduce myself: 
> > 
> > My name is Sebastian Oehms and I worked as a mathematician in the 90th. 
> I finished my mathematical career already in 1997 (after PhD), but in my 
> leisure time, I still like to think about mathematics. My favorites belong 
> to algebra and topology, especially algebras and groups being connected to 
> the Artin braid groups and questions about polynomial link invariants. 
> > 
> > The principal opportunity to do this, is on my daily rides on the subway 
> where I used to carry a (almost seven years old but mint colored) Acer 
> ASpire AO-Happy net-book. In 2016 I installed LinuxMint 17.3 on it in order 
> to work more with sage. Comfortably I can work on it with version 6.9 but 
> 8.2 is still usable. 
> > 
> > Since that time I learned much about sage and surely I need to learn 
> much more in order to help to improve it. But I think it's time to start 
> with this attempt, right now. 
> > 
> > Currently, I have problems to build version 8.2.beta5 on three systems 
> on which I am using sage: On each I got the following error: 
> > 
> > [gfortran-7.2.0] Host system: 
> > [gfortran-7.2.0] Linux SebaThinkPad 4.4.0-103-generic #126-Ubuntu SMP 
> Mon Dec 4 16:23:28 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux 
> > [gfortran-7.2.0] **************************************************** 
> > [gfortran-7.2.0] Error: gcc is already installed 
> > 
> > [gfortran-7.2.0] Host system: 
> > [gfortran-7.2.0] Linux SonyVAIO 3.19.0-32-generic #37~14.04.1-Ubuntu SMP 
> Thu Oct 22 09:41:40 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux 
> > [gfortran-7.2.0] **************************************************** 
> > [gfortran-7.2.0] Error: gcc is already installed 
> > 
> > 
> > [gfortran-7.2.0] Host system: 
> > [gfortran-7.2.0] Linux tchiboix 3.19.0-32-generic #37~14.04.1-Ubuntu SMP 
> Thu Oct 22 09:37:25 UTC 2015 i686 i686 i686 GNU/Linux 
> > [gfortran-7.2.0] **************************************************** 
> > [gfortran-7.2.0] Error: gcc is already installed 
> > 
> > 
> > On the first host (ThinkPad on LinuxMint 18 Mate) the previous 
> successful build was 8.2.beta4. But already for this I needed 2 attempts 
> since I had the problem with giac-1.4.9.45 described before by David 
> Coudert: 
> > 
> > https://groups.google.com/forum/#!topic/sage-devel/CHAgwg0spMg 
> > 
> > and which I could solve by the hint given by Francois Bissey (running 
> "sage -f gcc" before running make again). 
> > 
> > On the second host (LinixMint 17.3 Cinnamon) the previous successful 
> build was 8.2.beta2. Here I didn't do any attempts in the meantime. 
> > 
> > The third host is the Acer AO Happy (LinuxMint 17.3 Mate). The previous 
> successful build here was 8.2.beta3. When I tried to build beta4 on this 
> machine, I had the same problem as on the 
> > ThinkPad. The hint of Francois did not work here. 
> > 
> > The attached log-file belongs to the attempts on the ThinkPad! 
> > 
> > 
> > What can I do to run make successfully? 
> > 
> > 
> > 
> > -- 
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> > For more options, visit https://groups.google.com/d/optout. 
> > <gfortran-7.2.0.log> 
>
>

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