Built binary halts with "libsoup3 symbols detected. Using libsoup2 and libsoup3 in the same process is not supported."

[synthead]

Description of the bug

After building PrusaSlicer with the Linux dev guide at:

• https://github.com/prusa3d/PrusaSlicer/blob/master/doc/How%20to%20build%20-%20Linux%20et%20al.md

After calling the commands in the guide to start the built binary, I get this error:

$ cd src
$ ./prusa-slicer 

(process:213701): libsoup-ERROR **: 15:58:40.872: libsoup3 symbols detected. Using libsoup2 and libsoup3 in the same process is not supported.
Trace/breakpoint trap (core dumped)

This is on Arch Linux with automake downgraded to 1.16.5-2 to cater to #14081.

Project file & How to reproduce

1. Have Arch Linux available.
2. Downgrade automake to 1.16.5-2 via downgrade automake.
3. Follow the build guide at https://github.com/prusa3d/PrusaSlicer/blob/master/doc/How%20to%20build%20-%20Linux%20et%20al.md.
4. Observe the "libsoup3 symbols detected. Using libsoup2 and libsoup3 in the same process is not supported." error in the error as detailed above.

Checklist of files included above

• Project file
• Screenshot

Version of PrusaSlicer

Git sources, master at 5c7888b, tagged version_2.9.0

Operating system

Arch Linux (synced at 2025-02-16)

Printer model

Ender 3 NG v1.2