Prefigure Error that Module not found, but prefigure is installed

[Matt Wechter]

I get an error running pretext build print command that

error: Unable to generate some prefigure images:
error:  PTX ERROR: the "prefig" module has failed to load, and
error:   this is necessary for the task you have requested.  Perhaps
error:   you have not installed it?  Or perhaps you have forgotten to
error:   use a Python virtual environment you set up for this purpose?

But I can run prefig on the images individually and it works, so I know prefigure is on the computer downloaded with pipx.  This is with Pretext 2.40.2 on Ubuntu WSL on my Windows machine.  

I'm not getting these errors with a pretext build web command

[David Austin]

I'm definitely not an expert with WSL, but could a virtual environment be an issue?  That is, is pretext installed in a virtual environment and prefig in a different environment?

David

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[Oscar Levin]

I don't really understand pipx, but I think it creates a virtual environment for just the package you are installing.  So maybe `pipx install pretext` and `pipx install prefig` can't talk to each other.  There is a way to add a package to an existing virtual environment created with pipx.  Alternatively, try `pipx install pretext[all]` which will include prefigure as a dependency.

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[Matt Wechter]

Using pretext[all] takes me down a rabbit hole.  There's a problem in the case with pycairo

pip seemed to fail to build package:

    pycairo<2.0,>=1.20

Some possibly relevant errors from pip install:
    error: subprocess-exited-with-error
    ../cairo/meson.build:31:12: ERROR: Dependency lookup for cairo with method 'pkg-config' failed: Pkg-config for machine host machine not found. Giving up.
    error: metadata-generation-failed

And if I try to install pycairo separately with pip or pipx there are more errors.  I think this is why I originally only installed pretext and not pretext[all], but now I need prefigure working for my project.  Is there a way to run the prefigure files separately and just have my pretext project call to the output?

[David Austin]

You can try installing pycairo following instruction 3 here.

Alternatively, pycairo is only needed for plain text labels, meaning labels that are not inside <m> elements so if you don't have labels like that, then you'll be fine.  

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[Matt Wechter]

Thanks.  I'm making progress.  I had to download cairo first before pycairo.  Now I'm just having problems with something called rsvg-convert for the prefigure images.  Almost there!

[David Austin]

rsvg-convert is instruction 6!

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