Step 1. Fetch and check out the branch for this merge request

git fetch "https://gitlab.orfeo-toolbox.org/gpernot/otb.git" "feat-fix-itk-gcc9"
git checkout -b "gpernot/otb-feat-fix-itk-gcc9" FETCH_HEAD

Step 2. Review the changes locally

Step 3. Merge the branch and fix any conflicts that come up

git fetch origin
git checkout "origin/develop"
git merge --no-ff "gpernot/otb-feat-fix-itk-gcc9"

Step 4. Push the result of the merge to GitLab

git push origin "develop"

Note that pushing to GitLab requires write access to this repository.

Tip: You can also checkout merge requests locally by following these guidelines.