On Wed, 2021-03-17 at 03:42 +0000, ZmnSCPxj wrote:
> I understand.
> 
> This will require a largish amount of work I think.
> 
> Would this technique be acceptable?
> 
> * `add-before 'configure 'unvendor-externals`
>   * `rm -rf` the vendored externals.
>   * `ln -s` the needed `.h` and `.la`/`.a`/`.so` files from the
> `inputs` to the expected paths within the `external/` directory.
> 
> ?

Maybe simply add an option like --with-system-libbacktrace etc. in the
build system? And yes remove externals, I think that you should use a
snippet in the origin field instead of a phase for that.

> 
> We have a `requirements.txt` file which contains this, I duplicate
> below:
> 
> ```
> # Dependencies required to build and test c-lightning
> https://github.com/ElementsProject/libwally-core/releases/download/release_0.8.0/wallycore-0.8.0-cp36-cp36m-linux_x86_64.whl; 'linux' in sys_platform and python_version ==
> '3.6'
> https://github.com/ElementsProject/libwally-core/releases/download/release_0.8.0/wallycore-0.8.0-cp37-cp37m-linux_x86_64.whl; 'linux' in sys_platform and python_version ==
> '3.7'
> https://github.com/ElementsProject/libwally-core/releases/download/release_0.8.0/wallycore-0.8.0-cp37-cp37m-macosx_10_14_x86_64.whl; sys_platform == 'darwin' and python_version ==
> '3.7'
> mrkd ~= 0.1.6
> Mako ~= 1.1.3
> 
> # Dependencies from pyln-client
> Sphinx ~= 3.4.0
> flake8==3.7.8
> recommonmark>=0.7.*
> sphinx-rtd-theme==0.4.2
> sphinxcontrib-websupport==1.1.0
> tqdm==4.32.2
> 
> # Dependencies from pyln-testing
> Flask==1.1.*
> cheroot==8.5.*
> ephemeral-port-reserve==1.1.1
> filelock==3.0.*
> flaky ~= 3.7.0
> psutil==5.7.*
> psycopg2-binary==2.8.*
> pytest-rerunfailures==9.1.1
> pytest-timeout ~= 1.4.2
> pytest-xdist ~= 2.2.0
> pytest==6.1.*
> python-bitcoinlib==0.11.*
> 
> # Dependencies from pyln-proto
> base58 ~= 2.0.1
> bitstring ~= 3.1.6
> coincurve ~= 13.0.0
> cryptography ~= 3.2
> mypy ~= 0.790
> pysocks ~= 1.7.1
> 
> # Dependencies from pyln-spec
> # None
> ```

Thank you, I am going to go through them.

> Incidentally, we also install some Python modules.
> How do I "properly" export the Python modules within Guix?

I will ask someone else here but you might have to mix the python-
build-system in.

Léo