opentype-feature-freezer: name 'fontTools' is not defined

Nixpkgs version

nixos-unstable

Describe the bug

Trying to use the cli tool, doesn't work, gives that error

Steps to reproduce

1. Install (in config or nix shell) the package
2. Try to use the program, even using pyftfeatfreeze -f 'ss03,ss04,ss05,cv02,cv06,cv10' -S -U retblast -R 'CommitMonoV143/CommitMono' CommitMono-400-Regular.ttf test.ttf doesn't work

Expected behaviour

The program just works. I thought maybe it broke, I asked a friend to test it on their macbook, worked fine.

Screenshots

No response

Relevant log output

WARNING: [_openFontTTX] TTX cannot open CommitMono-400-Regular.ttf: name 'fontTools' is not defined
ERROR: Failed to open font. Aborting.
WARNING: Errors during processing.

Additional context

No response

System metadata

• system: "x86_64-linux"
• host os: Linux 6.17.7-zen1, NixOS, 25.11 (Xantusia), 25.11.20251111.9da7f1c
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.31.2
• nixpkgs: /nix/store/cjjpqrp9xy44j5fjh3mygyxy3i7mslj2-source

Notify maintainers

@jopejoe1

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• I assert that this is a bug and not a support request.
• I assert that this is not a duplicate of an existing issue.
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Start by reproducing the failure with the provided pyftfeatfreeze command and inspect the package's CLI entry point and nixpkgs definition. Trace why fontTools is unavailable during font loading. Done means the command opens the font and produces test.ttf without the reported error.