On Ubuntu 16.04 x86_64 Xeon E5-2623 + 16 GB RAM, after a fresh git clone + 
pull develop, make -j8 failled with the following error:

===========================
cd ../.. && sage-logger -p './sage --docbuild --no-pdf-links all html ' 
logs/dochtml.log
[dochtml] /home/eric/sage/7.5.beta6/local/bin/python: No module named 
interpreters.wrapper_rdf; 'sage_setup.docbuild' is a package and cannot be 
directly executed
Makefile:1063 : la recette pour la cible « doc-html » a échouée
make[2]: *** [doc-html] Erreur 1
make[2] : on quitte le répertoire « /home/eric/sage/7.5.beta6/build/make »
Makefile:886 : la recette pour la cible « all » a échouée
make[1]: *** [all] Erreur 2
make[1] : on quitte le répertoire « /home/eric/sage/7.5.beta6/build/make »

real    28m48.747s
user    182m38.168s
sys    22m4.972s
***************************************************************
Error building Sage.

The following package(s) may have failed to build (not necessarily
during this run of 'make all'):

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:16 : la recette pour la cible « all » a échouée
make: *** [all] Erreur 1
==========================================

Running make again (simply 'make', no parallelization) resulted in a 
successful build.  

Then make ptestlong gave "All tests passed!" but with a slow doctest 
warning:

==========================================
sage -t --long --warn-long 54.1 src/sage/symbolic/series.pyx
**********************************************************************
File "src/sage/symbolic/series.pyx", line 97, in sage.symbolic.series
Warning, slow doctest:
    sin(x*sin(x*sin(x*sin(x)))).series(x,12)
Test ran for 75.18 s
    [51 tests, 79.47 s]
==========================================

This seems to be sporadic: running 
./sage -t --long --warn-long 54.1 src/sage/symbolic/series.pyx
yields 

==========================================
Running doctests with ID 2016-12-12-15-13-48-d0fd7083.
Git branch: develop
Using --optional=mpir,python2,sage
Doctesting 1 file.
sage -t --long --warn-long 54.1 src/sage/symbolic/series.pyx
    [51 tests, 0.32 s]
----------------------------------------------------------------------
All tests passed!
----------------------------------------------------------------------
Total time for all tests: 0.4 seconds
    cpu time: 0.3 seconds
    cumulative wall time: 0.3 seconds
==========================================

Running it again gave the warning, then no warning, then the same warning 
again...

Eric. 


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