Ghostty won't start after GTK4 update: undefined symbol: g_timeout_source_new_ns

[naxels]

Issue Description

When opening Ghostty on CachyOS KDE on both my PC and Laptop, instead of launching Ghostty, I now see an error on both

Expected Behavior

Ghostty launching...

Actual Behavior

When running from the GUI: Could not activate remote peer 'com.mitchellh.ghostty': startup job failed

When running from any Terminal (without any options):
ghostty: symbol lookup error: /usr/lib/libgtk-4.so.1: undefined symbol: g_timeout_source_new_ns

Reproduction Steps

1. Update CachyOS KDE with ghostty and gtk4 installed as of October 10th, 2026, after the gtk4 update, Ghostty won't launch anymore even after a reboot.

Ghostty Logs

No response

Ghostty Version

ghostty +version

ghostty: symbol lookup error: /usr/lib/libgtk-4.so.1: undefined symbol: g_timeout_source_new_ns

pacman -Q | grep ghostty

ghostty 1.3.1-2.2
ghostty-shell-integration 1.3.1-2.2
ghostty-terminfo 1.3.1-2.2

pacman -Q | grep gtk4

gtk4 1:4.24.1-1
gtk4-layer-shell 1.3.0-1.1
libnma-gtk4 1.10.6-3.1

### OS Version Information

CachyOS KDE (latest as of October 7th 2026)

### (Linux only) Display Server

Wayland

### (Linux only) Desktop Environment/Window Manager

KDE Plasma 6.7.5

### Minimal Ghostty Configuration

```ini
** no configuration has been changed by me after ghostty install **

Additional Relevant Configuration

No response

I acknowledge that:

• I have reviewed the FAQ and confirm that my issue is NOT among them.
• I have searched the Ghostty documentation and confirm there doesn't exist a configuration option that solves my issue.
• I have searched the Ghostty repository (both open and closed Discussions and Issues) and confirm this is not a duplicate of an existing issue or discussion.
• I have checked the "Preview" tab on all text fields to ensure that everything looks right, and have wrapped all configuration and code in code blocks with a group of three backticks (```) on separate lines.

[pluiedev]

Can you reproduce when compiling from source?

[pluiedev]

https://nomeatproxy.com/

[naxels]

I've never compiled Ghostty from source, if i have some more time i will try to figure it out.

regarding to what the comment says about partial upgrades, i don't think that is the issue here as CachyOS uses arch-update to run various updates/scripts, very likely not doing partials

[pluiedev]

Please stop reposting LLM output as your own language. I think we all know how to talk to LLMs at this point. You are henceforth denounced and you're not to engage in this discussion board in the future.

[pluiedev]

!denounce @Martzcode Repeated meatproxying in spite of prior warning

[paaloeye]

@naxels Ghostty is super easy to build — just zig build.

[naxels]

Since I use Ghostty both on my PC and Laptop on CachyOS KDE, I noticed that after a reboot, Ghostty works most of the time, only sometimes producing the GUI error: Could not activate remote peer 'com.mitchellh.ghostty': startup job failed

I'm not able to reproduce the random times that it doesn't work when starting from the Konsole app, therefor given that it only appears very randomly now, I think my problem is fixed :)

[jcollie]

My guess is that your problem is #14399