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Hi FreeSurfer community,

I'm running into an issue with the longitudinal FreeSurfer pipeline.

Background:

I'm working with T1-weighted MRI scans from an aerobic exercise intervention 
study in older adults (age 60+).
I have two timepoints per subject: pre- and post-intervention.
Cross-sectional `recon-all` has successfully completed for both timepoints.
I'm now trying to run the longitudinal pipeline using `recon-all -base`, but 
I'm getting a glibc/license-related error.

Command:

```bash
recon-all -base sub002base \
  -tp /rds/projects/s/segaertk-chbh-00077/Structural/FreeSurfer/sub002_tp1 \
  -tp /rds/projects/s/segaertk-chbh-00077/Structural/FreeSurfer/sub002_tp2 \
  -all
```

Error:
```
GNU libc version: 2.28
ERROR: Systems running GNU glibc version greater than 2.15
  require a newly formatted license file (it's free). Please
  download a new one from the following page:
  
http://secure-web.cisco.com/1S-XRYZwdfIh6LBaYDmryClXzVhMGn3s7IZR6N9Pa3Ony7_a2cbH1Sx1QqHesgVpGJk-c__nPVSoXcsAsXjV7YXUYJjAqTmV4hPJ-GLk-SJvZ4E1GuwgotrtXYt2WaeTRBusKnDT6i9lsH8MfmhcIqDmX8knb_jC8YVFVgyGKqooeBApCTud-iDpX_MptaSY1sx72t2dD5qKaah0eQS97aMc1KOuaxMUXvZKPpE2kAw22sWKLTP42_SHUtKgngyZkZm1GslT3yqYw58aCjdMXSOEoQaDN9jIVFR6BIYGtFa52WHWQt_I-W9FN4q8TWjX-63UdQIHEdZjvCoz73aMITQ/http%3A%2F%2Fsurfer.nmr.mgh.harvard.edu%2Fregistration.html
```

Notes:

I have a valid, updated license file (downloaded from the official site).
I set the license path before running the command:

  ```bash
  export FS_LICENSE=${HOME}/license.txt
  ```
Weirdly, the cross-sectional `recon-all` works fine using the same environment 
and license file.

I'm using FreeSurfer version: FreeSurfer/6.0.1-centos6_x86_64
My system is running glibc 2.28.

What I've Tried:


  *   Verified that `$FS_LICENSE` is exported and correct.
  *   Checked for any outdated `license.txt` in `$FREESURFER_HOME` and replaced 
it.
  *   Confirmed that `recon-all -version` and `which recon-all` return the 
expected FreeSurfer install.
  *   Deleted partial `sub002base` folder and retried clean.

Has anyone encountered this behaviour - where the cross-sectional `recon-all` 
works, but `recon-all -base` fails due to the license/glibc issue?

Any help would be greatly appreciated!

Warmest regards,

Foyzul.

Dr Foyzul Rahman
Centre for Human Brain Health (CHBH)
University of Birmingham
United Kingdom

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