(this was meant to be a comment but it's too long)
So, the compilation process worked within my /home directory. However, after about an hour I got a real error this time:
***************************************************************
Error building Sage.
The following package(s) may have failed to build (not necessarily
during this run of 'make all-start'):
* package: openblas-0.2.20.p2
log file: /home/matthias/sage-8.4/logs/pkgs/openblas-0.2.20.p2.log
build directory: /home/matthias/sage-8.4/local/var/tmp/sage/build/openblas-0.2.20.p2
The build directory may contain configuration files and other potentially
helpful information. WARNING: if you now run 'make' again, the build
directory will, by default, be deleted. Set the environment variable
SAGE_KEEP_BUILT_SPKGS to 'yes' to prevent this.
Makefile:31 : la recette pour la cible « all-start » a échouée
make[1]: *** [all-start] Erreur 1
make[1] : on quitte le répertoire « /home/matthias/sage-8.4 »
Makefile:13 : la recette pour la cible « all » a échouée
make: *** [all] Erreur 2
Here is the mentioned log.
So, at this point, I don't mind starting a new compilation from scratch, nevertheless,
1) Can I resume a failed compilation after a possible fix of what's amiss?
2) Why is that happening? Is there any risk some other package might do the same?
Thank you