>From sage-devel (see also my reply there):

>> [sagelib-7.4.beta2] Building interpreters for fast_callable
>> [sagelib-7.4.beta2] python -u setup.py install
>> [sagelib-7.4.beta2]
>> ************************************************************************
>> [sagelib-7.4.beta2] Traceback (most recent call last):
>> [sagelib-7.4.beta2]   File "setup.py", line 47, in <module>
>> [sagelib-7.4.beta2]     from module_list import ext_modules,
>> library_order, aliases
>> [sagelib-7.4.beta2]   File
>> "/home/agag/sbrandhorst/sage/sage/src/module_list.py", line 150, in <module>
>> [sagelib-7.4.beta2]     from sage_setup.optional_extension import
>> OptionalExtension
>> [sagelib-7.4.beta2]   File
>> "/home/agag/sbrandhorst/sage/sage/src/sage_setup/optional_extension.py",
>> line 24, in <module>
>> [sagelib-7.4.beta2]     all_packages = list_packages(local=True)
>> [sagelib-7.4.beta2]   File
>> "/home/agag/sbrandhorst/sage/sage/src/sage/misc/package.py", line 211,
>> in list_packages
>> [sagelib-7.4.beta2]     installed = installed_packages()
>> [sagelib-7.4.beta2]   File
>> "/home/agag/sbrandhorst/sage/sage/src/sage/misc/package.py", line 293,
>> in installed_packages
>> [sagelib-7.4.beta2]     installed.update(pip_installed_packages())
>> [sagelib-7.4.beta2]   File
>> "/home/agag/sbrandhorst/sage/sage/src/sage/misc/package.py", line 147,
>> in pip_installed_packages
>> [sagelib-7.4.beta2]     proc = subprocess.Popen(["pip", "list"],
>> stdout=subprocess.PIPE)
>> [sagelib-7.4.beta2]   File
>> "/home/agag/sbrandhorst/sage/sage/local/lib/python/subprocess.py", line
>> 710, in __init__
>> [sagelib-7.4.beta2]     errread, errwrite)
>> [sagelib-7.4.beta2]   File
>> "/home/agag/sbrandhorst/sage/sage/local/lib/python/subprocess.py", line
>> 1335, in _execute_child
>> [sagelib-7.4.beta2]     raise child_exception
>> [sagelib-7.4.beta2] OSError: [Errno 2] No such file or directory


Anyone else ever seen this (when building from scratch)?


This will presumably indirectly get fixed by #21291, but I think we
should explicitly add a dependency on pip (in case there isn't one,
haven't checked).


-leif

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