Final permutation test. try gcc-13 and hope.

.github/workflows/build_viewer.yml

@@ -125,18 +125,16 @@ jobs:
         with: 
           swap-storage: false
 
-      - name: Install GCC-14
+      - name: Install GCC-13
         if: runner.os == 'Linux'
         run: |
           sudo apt-get update
-          sudo apt-get install -y software-properties-common
           sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
-          sudo apt-get update
-          sudo apt-get install -y gcc-14 g++-14
-          echo "CC=gcc-14"  >> $GITHUB_ENV
-          echo "CXX=g++-14" >> $GITHUB_ENV
-
-
+          sudo apt-get install -y gcc-13 g++-13
+          sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-13 130 \
+            --slave /usr/bin/g++ g++ /usr/bin/g++-13
+          echo "CC=gcc-13"  >> $GITHUB_ENV
+          echo "CXX=g++-13" >> $GITHUB_ENV
       - name: Setup rclone and download the folder
         uses: beqjanus/setup-rclone@main
         with: