Compiling Sage on Ubuntu 20.05

[Saksham]

Hi all, 

I have been trying to install sage 9.5 from source on Ubuntu. 

After running the following command i get an error.

CC=gcc-7 CXX=g++ FC=gfortran-7 ./configure

The error that i get is. 

configure: error:

    Given --with-system-gcc=force, but no system package could be used.
    That's an error.  Please install the indicated package to continue.
    (To override this error, use ./configure --without-system-gcc)

Does anyone have a solution for this ? (using -without-system-gcc does fix this error but why could system package not be used)

Thanks,

Saksham.

[Thierry Dumont]

You should start by installing "build-essential" and gfortran. To do
this you have to do:

sudo apt update
sudo apt install build-essential gfortran

sudo is mandatory (rivileged (root) access).

build-essential contains gcc and g++ compilers as well as some libraries
and tools, but not the fortran compiler (gfortran).

You will certainly have to install other tools and libraries. Follow
sage installation procedure, you will get the list of what too install.

Yours,
t.d.

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[slelievre]

2022-02-27 13:08:36 UTC+1, Saksham:
>
> CC=gcc-7 CXX=g++ FC=gfortran-7 ./configure

What do the following give?
```
$ which gcc-7
$ which g++
$ which gfortran-7
$ gcc-7 --version
$ g++ --version
$ gfortran-7 --version

```

[Eric Gourgoulhon]

A quick way to install Sage 9.5 from sources on Ubuntu 20.04 is decribed at

https://sagemanifolds.obspm.fr/install_ubuntu.html

HTH.

Eric.