Work on build-tarball.

Author: bhaible

.github/workflows/many-platforms.yml

@@ -54,7 +54,7 @@ jobs:
       - run: pwd
       # Install Ubuntu packages.
       # List of packages: https://packages.ubuntu.com/
-      - run: sudo apt update; sudo apt install autopoint gperf
+      - run: sudo apt update; sudo apt install autopoint gperf gettext
       - run: |
           ./build-tarball.sh '${{ env.package }}'
       # Doc: https://github.com/actions/upload-artifact?tab=readme-ov-file#usage