Hi, 

On Ubuntu 16.04.1, after a fresh git clone + git pull origin develop + 
make, build failed with the message

[sagelib-7.4.beta1] python -c "from sage_setup.autogen.interpreters import 
rebuild; rebuild('sage/ext/interpreters')"
[sagelib-7.4.beta1] Building interpreters for fast_callable
[sagelib-7.4.beta1] python -u setup.py install
[sagelib-7.4.beta1] 
************************************************************************
[sagelib-7.4.beta1] Traceback (most recent call last):
[sagelib-7.4.beta1]   File "setup.py", line 47, in <module>
[sagelib-7.4.beta1]     from module_list import ext_modules, library_order, 
aliases
[sagelib-7.4.beta1]   File "/home/eric/sage/beta1/src/module_list.py", line 
384, in <module>
[sagelib-7.4.beta1]     package = 'mcqd'),
[sagelib-7.4.beta1]   File 
"/home/eric/sage/beta1/src/sage_setup/optional_extension.py", line 77, in 
OptionalExtension
[sagelib-7.4.beta1]     condition = is_package_installed(pkg)
[sagelib-7.4.beta1]   File 
"/home/eric/sage/beta1/src/sage/misc/package.py", line 311, in 
is_package_installed
[sagelib-7.4.beta1]     return any(p.split('-')[0] == package for p in 
installed_packages())
[sagelib-7.4.beta1]   File 
"/home/eric/sage/beta1/src/sage/misc/package.py", line 291, in 
installed_packages
[sagelib-7.4.beta1]     installed.update(pip_installed_packages())
[sagelib-7.4.beta1]   File 
"/home/eric/sage/beta1/src/sage/misc/package.py", line 147, in 
pip_installed_packages
[sagelib-7.4.beta1]     proc = subprocess.Popen(["pip", "list"], 
stdout=subprocess.PIPE)
[sagelib-7.4.beta1]   File 
"/home/eric/sage/beta1/local/lib/python/subprocess.py", line 710, in 
__init__
[sagelib-7.4.beta1]     errread, errwrite)
[sagelib-7.4.beta1]   File 
"/home/eric/sage/beta1/local/lib/python/subprocess.py", line 1335, in 
_execute_child
[sagelib-7.4.beta1]     raise child_exception
[sagelib-7.4.beta1] OSError: [Errno 2] No such file or directory
[sagelib-7.4.beta1] 
************************************************************************
[sagelib-7.4.beta1] Error building the Sage library
[sagelib-7.4.beta1] 
************************************************************************
[sagelib-7.4.beta1] Please email sage-devel 
(http://groups.google.com/group/sage-devel)
[sagelib-7.4.beta1] explaining the problem and including the relevant part 
of the log file
[sagelib-7.4.beta1]   /home/eric/sage/beta1/logs/pkgs/sagelib-7.4.beta1.log
[sagelib-7.4.beta1] Describe your computer, operating system, etc.
[sagelib-7.4.beta1] 
************************************************************************

(the content of /home/eric/sage/beta1/logs/pkgs/sagelib-7.4.beta1.log is 
the same as above)

System: Ubuntu 16.04.1 LTS x86_64
gcc 5.4.0
Hardware: Intel Core i5-2410M + 4 GB RAM

Any idea?

Eric.

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