`fontconfig` Homebrew package broken on updated macOS 15 and 26 images

[torokati44]

Description

The fontconfig package installed from Homebrew is no longer usable by fontconfig-rs.
The installed package is at version 2.18, but for some reason the Rust crate receives a library path for 2.17 from pkg-config.

Platforms affected

• Azure DevOps
• GitHub Actions - Standard Runners
• GitHub Actions - Larger Runners

Runner images affected

• Ubuntu 22.04
• Ubuntu 24.04
• Ubuntu Slim
• macOS 14
• macOS 14 Arm64
• macOS 15
• macOS 15 Arm64
• macOS 26
• macOS 26 Arm64
• Windows Server 2022
• Windows Server 2025
• Windows Server 2025 with Visual Studio 2026

Image version and build link

20260525.0107.1
https://github.com/actions/runner-images/releases/tag/macos-26-arm64%2F20260525.0107

Is it regression?

yes, it worked on 20260520.0098.1

Expected behavior

https://github.com/ruffle-rs/ruffle/actions/runs/26542412111/job/78186748240?pr=23842

Actual behavior

https://github.com/ruffle-rs/ruffle/actions/runs/26542412111/job/78636906152?pr=23842

Repro steps

Try to build something that uses the fontconfig-rs Rust crate.

[torokati44]

For macos-15-arm, 20260520.0085.1 still worked, and 20260527.0100.1 is broken the same way.

[torokati44]

Don't know, don't care. 🤷‍♂️

[pierreluc16]

For macos-15-arm, 20260520.0085.1 still worked, and 20260527.0100.1 is broken the same way.

From google fontconfig 2.18 was released on 21 May 2026 not sure if it a image runner bug.

[torokati44]

fontconfig-rs gets the info about the library from pkg-config, and has no mention of any specific library version anywhere.
pkg-config shouldn't output an outdated version for the library.

[pierreluc16]

fontconfig-rs gets the info about the library from pkg-config, and has no mention of any specific library version anywhere. pkg-config shouldn't output an outdated version for the library.

The problem is pkg-config ?

[torokati44]

Perhaps a .pc file for fontconfig somewhere does not match the version of the library actually installed by homebrew anymore...?

[pierreluc16]

Perhaps a .pc file for fontconfig somewhere does not match the version of the library actually installed by homebrew anymore...?

Likely need to wait monday for a contributor comment about this problem.