Missing definition for Add_-h in two modules

[seisman]

No description provided.

[PaulWessel]

Great

[github-actions]

The backport to 6.1 failed:

The process 'git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-6.1 6.1
# Navigate to the new working tree
cd .worktrees/backport-6.1
# Create a new branch
git switch --create backport-4148-to-6.1
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick 9f038fc53d29e2f75f71651e3190dd2679240fb9
# Push it to GitHub
git push --set-upstream origin backport-4148-to-6.1
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-6.1

Then, create a pull request where the base branch is 6.1 and the compare/head branch is backport-4148-to-6.1.