[Freesurfer] Qdec not running ("image not found" error message)

[Lab of Autism and Developmental Neuroscience, Lab of Autism and Developmental Neuroscience]

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Dear Freesurfer experts,

Please help me with this simple error for running Qdec:
- First I try to open qdec:
qdec &

- Then this occurs:

Library not loaded: /opt/X11/lib/libGLU.1.dylib

  Referenced from: /Applications/freesurfer/bin/qdec.bin

  Reason: image not found

Abort


Any ideas on how I could fix this? Thanks!
All the best,
Alex

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