diff --git a/.github/workflows/build-all.yml b/.github/workflows/build-all.yml
index 95b68e45d..012ae0846 100644
--- a/.github/workflows/build-all.yml
+++ b/.github/workflows/build-all.yml
@@ -1,4 +1,3 @@
-
 name: build-all
 
 on:
@@ -22,11 +21,33 @@ jobs:
           fetch-depth: 0
           submodules: true
 
+      - name: Calculate version number and set OOLITE_VERSION
+        id: version
+        run: |
+          set -x
+          cd oolite
+          # Build version string,
+          # taking into account that we may have just two digits
+          VERSION=$(cat src/Cocoa/oolite-version.xcconfig | cut -d '=' -f 2)
+          VER_MAJ=$(echo ${VERSION} | cut -d. -f1)
+          VER_MIN=$(echo ${VERSION} | cut -d. -f2)
+          VER_REV=$(echo ${VERSION} | cut -d. -f3)
+          if [ "" == "${VER_REV}" ]
+          then
+            VER_REV="0"
+          fi
+          VER_DATE=$(date +%y%m%d)
+          VER_GITREV=$(git rev-list --count HEAD)
+          VER_GITHASH=$(git rev-parse --short=7 HEAD)
+          VER="${VER_MAJ}.${VER_MIN}.${VER_REV}.${VER_GITREV}-${VER_DATE}-${VER_GITHASH}"
+          echo "OOLITE_VERSION=${VER}" >> "$GITHUB_OUTPUT"
+          echo "OOLITE_VERSION=${VER}" >> Doc/OOLITE_VERSION.txt
+
       - name: generate PDFs
         run: |
           find oolite/Doc -name "*.odt" -exec soffice --headless --convert-to pdf:"writer_pdf_Export" --outdir oolite/Doc {} \;
-          zip oolite-doc.zip oolite/Doc/*.pdf
-          
+          zip oolite-doc.zip oolite/Doc/*.pdf oolite/Doc/OOLITE_VERSION.txt
+
       - name: Archive generated documentation
         uses: actions/upload-artifact@v3
         with:
@@ -40,7 +61,7 @@ jobs:
     needs: [common-steps]
     steps:
       ## This is for debugging only and helps developing the workflow.
-      #- name: Environment Variables
+      # - name: Environment Variables
       #  run: |
       #    printenv | sort
 
@@ -61,7 +82,7 @@ jobs:
         with:
           name: oolite-doc
           path: artifacts
-          
+
       - name: Extract PDFs
         run: |
           unzip -u artifacts/oolite-doc.zip
@@ -70,15 +91,15 @@ jobs:
       - name: show filesystem before build
         run: |
           find . -not -path "./oolite/deps/Windows-deps/*" -not -path "./oolite/Mac-specific/*" -not -path "./oolite/.git/*"
-      
+
       - name: compiling up to installer script (.run file)
         run: |
           cd oolite
           source /usr/share/GNUstep/Makefiles/GNUstep.sh
           make -f Makefile pkg-posix-nightly HOST_ARCH=$(uname -m)
-          
+
       ## This is for debugging only and helps developing the workflow.
-      #- name: show filesystem after build
+      # - name: show filesystem after build
       #  run: |
       #    find . -not -path "./oolite/Mac-specific/*"  -not -path "./oolite/deps/Windows-deps/*" -not -path "./oolite/tests/*" -not -path "./oolite/.git/*" -not -path "./oolite/deps/mozilla/*"
 
@@ -91,12 +112,12 @@ jobs:
         run: |
           NAME=$(basename oolite-nightly/oolite-*.run .run)
           tar cvfz ${NAME}.tgz -C oolite-nightly .
-      
+
       # This is for debugging only and helps developing the workflow.
       - name: show filesystem after installer
         run: |
           find . -not -path "./oolite/Mac-specific/*" -not -path "./oolite/deps/*" -not -path "./oolite/tests/*" -not -path "./oolite/.git/*"
-          
+
       - name: Archive build tar ball
         uses: actions/upload-artifact@v3
         with:
@@ -104,21 +125,21 @@ jobs:
           path: |
             oolite-*.tgz
           retention-days: 5
-          
+
 
   build-windows:
     runs-on: windows-latest
     needs: [common-steps]
     steps:
       ## This is for debugging only and helps developing the workflow.
-      #- name: Environment Variables
+      # - name: Environment Variables
       #  run: |
       #    Get-ChildItem Env: | Sort Name
 
       - name: Checkout DevelopmentEnvironment
         uses: actions/checkout@v3
         with:
-          repository:  OoliteProject/oolite-windows-build-env
+          repository: OoliteProject/oolite-windows-build-env
           path: DevelopmentEnvironment
 
       - name: Checkout Oolite
@@ -133,7 +154,7 @@ jobs:
         with:
           name: oolite-doc
           path: artifacts
-          
+
       - name: Extract PDFs
         run: |
           unzip -u artifacts/oolite-doc.zip
@@ -147,7 +168,7 @@ jobs:
       - name: Compile
         shell: cmd
         run: D:\a\oolite\oolite\DevelopmentEnvironment\gcc\Msys_x2\1.0\msys.cmd
-          
+
       # check http://aegidian.org/bb/viewtopic.php?p=281821#p281821
       # this is for debug only; it creates huge logs and takes a long time to execute, yet you never know when you need it
       - name: check filesystem
@@ -164,6 +185,7 @@ jobs:
 
   build-doxygen:
     runs-on: ubuntu-latest
+    needs: [common-steps]
     steps:
       - name: Checkout Oolite
         uses: actions/checkout@v3
@@ -172,24 +194,45 @@ jobs:
           fetch-depth: 0
           submodules: true
 
+      - name: Download artifacts
+        uses: actions/download-artifact@v3
+        with:
+          name: oolite-doc
+          path: artifacts
+
+      - name: Extract artifacts
+        run: |
+          unzip -u artifacts/oolite-doc.zip
+
+      - name: set version
+        id: version
+        run: |
+          OOLITE_VERSION=$(cat oolite/Doc/OOLITE_VERSION.txt | cut -d= -f2)
+          echo "OOLITE_VERSION=${OOLITE_VERSION}" >> "$GITHUB_OUTPUT"
+          sed -i -e "/PROJECT_NUMBER\s*=/ s/=.*/=${OOLITE_VERSION}/" oolite/Doxyfile
+          cat oolite/Doxyfile
+
       - name: Run doxygen
         uses: mattnotmitt/doxygen-action@v1.9.5
         with:
           working-directory: oolite
+          #  OOLITE_VERSION: ${{ steps.version.outputs.OOLITE_VERSION }}
 
       ## This is for debugging only and helps developing the workflow.
-      #- name: Environment Variables 1
+      # - name: Environment Variables 1
       #  run: |
       #    printenv | sort
       #    find . -not -path "./oolite/deps/*" -not -path "./oolite/Mac-specific/*" -not -path "./oolite/.git/*"
 
       - name: create tar ball
         run: |
-          tar cvfz oolite-apidoc.tgz -C oolite doxygen
+          tar cvfz oolite-apidoc-${{ steps.version.outputs.OOLITE_VERSION }}.tgz -C oolite doxygen
+
       # This is for debugging only and helps developing the workflow.
       - name: Environment Variables 2
         run: |
           find . -not -path "./oolite/deps/*" -not -path "./oolite/Mac-specific/*" -not -path "./oolite/.git/*"
+
       - name: Archive build tar ball
         uses: actions/upload-artifact@v3
         with:
@@ -203,7 +246,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       ## This is for debugging only and helps developing the workflow.
-      #- name: Environment Variables
+      # - name: Environment Variables
       #  run: |
       #    printenv | sort
 
@@ -216,7 +259,30 @@ jobs:
       - name: show filesystem after download
         run: |
           find .
-          
+
+      - name: Extract artifacts
+        run: |
+          ls -l artifacts
+          unzip -u artifacts/oolite-doc/oolite-doc.zip
+
+      - name: set version
+        id: version
+        run: |
+          OOLITE_VERSION=$(cat oolite/Doc/OOLITE_VERSION.txt | cut -d= -f2)
+          echo "OOLITE_VERSION=${OOLITE_VERSION}" >> "$GITHUB_OUTPUT"
+
+      - name: Remove old prereleases
+        if: github.ref != 'refs/heads/master'
+        uses: s00d/delete-older-releases@0.2.1
+        with:
+          # repo: <owner>/<repoName> # defaults to current repo
+          keep_latest: 7
+          # delete_tag_pattern: v\d+\.\d+\.\d+-.*
+          delete_type: 'prerelease'
+          # delete_branch: '${{ github.ref_name }}'
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
       # For changes on master branch, create a new release.
       # It should move the 'latest' tag automatically.
       - name: Create Release
@@ -225,9 +291,10 @@ jobs:
         uses: "marvinpinto/action-automatic-releases@latest"
         with:
           repo_token: "${{ secrets.GITHUB_TOKEN }}"
-          automatic_release_tag: "latest"
+          # automatic_release_tag: "latest"
+          automatic_release_tag: "${{ steps.version.outputs.OOLITE_VERSION }}"
           prerelease: true
-          title: "Oolite Nightly"
+          title: "Oolite ${{ steps.version.outputs.OOLITE_VERSION }}"
           files: |
             artifacts/oolite-documentation-nightly/oolite-*.tgz
             artifacts/oolite-linux-nightly/oolite-*.tgz
diff --git a/Doxyfile b/Doxyfile
index 9209903cb..b91d84e16 100644
--- a/Doxyfile
+++ b/Doxyfile
@@ -38,7 +38,7 @@ PROJECT_NAME           = "Oolite"
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = 
+PROJECT_NUMBER         = $(OOLITE_VERSION)
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a