pip3-installing SCons on current Raspbian Stretch fails

Hi, *

a) I have a Raspberry 3 with the latest Raspbian Stretch release:

pi@raspi_rsdk1:~ $ uname -a

Linux raspi_rsdk1 4.14.79-v7+ #1159 SMP Sun Nov 4 17:50:20 GMT 2018 armv7l GNU/Linux

b) the 'default' python is a Py2:

pi@raspi_rsdk1:~ $ python -V

Python 2.7.13

c) pip-installing Scons and running it works fine:

pi@raspi_rsdk2:~ $ which scons

/usr/local/bin/scons

pi@raspi_rsdk2:~ $ scons --version

SCons by Steven Knight et al.:

script: v3.0.4.3a41ed6b288cee8d085373ad7fa02894e1903864, 2019-01-20 22:51:36, by bdeegan on kufra

engine: v3.0.4.3a41ed6b288cee8d085373ad7fa02894e1903864, 2019-01-20 22:51:36, by bdeegan on kufra

engine path: ['/usr/local/lib/python2.7/dist-packages/scons/SCons']

Copyright (c) 2001 - 2019 The SCons Foundation

Because the Raspberry is only one of multiple target platforms for us and all other target platforms have been migrated to Py3, I wanted to do the same for Raspian:

d) pip3-installing SCons fails:

pi@raspi_rsdk1:~ $ sudo pip3 install scons

Collecting scons

Using cached https:/blabla/scons-3.0.4-py2.py3-none-any.whl

Installing collected packages: scons

Exception:

Traceback (most recent call last):

File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in main

status = self.run(options, args)

File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 360, in run

prefix=options.prefix_path,

File "/usr/lib/python3/dist-packages/pip/req/req_set.py", line 784, in install

**kwargs

File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 851, in install

self.move_wheel_files(self.source_dir, root=root, prefix=prefix)

File "/usr/lib/python3/dist-packages/pip/req/req_install.py", line 1064, in move_wheel_files

isolated=self.isolated,

File "/usr/lib/python3/dist-packages/pip/wheel.py", line 377, in move_wheel_files

clobber(source, dest, False, fixer=fixer, filter=filter)

File "/usr/lib/python3/dist-packages/pip/wheel.py", line 316, in clobber

ensure_dir(destdir)

File "/usr/lib/python3/dist-packages/pip/utils/__init__.py", line 83, in ensure_dir

os.makedirs(path)

File "/usr/lib/python3.5/os.py", line 241, in makedirs

mkdir(name, mode)

FileNotFoundError: [Errno 2] No such file or directory: '/usr/local/man/man1'

e) the Py3 on Raspbian is

pi@raspi_rsdk1:~ $ python3 -V

Python 3.5.3

Now my question:

1. I guess I need to address the pip3 install problem from above to a Raspbian mailing list, correct? It's pip3 which is causing the trouble, right? Or is the offending path to /usr/local/man/man1 coming from SCons?

2. Is anyone here who is using sucessfully using SCons with Py3 on Raspbian?

2. looking into /usr/local/bin/scons, I found that scons is she-banged to "python", so in case nothing in PATH is tweaked, scons will end up using Py2 at least on Raspbian where both are available per default. The SCons man says that Py3 is prefered, so the assumption behind this is that the user is linking "python" to "python3" in order to use Py3 as engine under the hood. Correct?

Thx for your time and help

Arndt

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