diff --git a/.github/workflows/build_viewer.yml b/.github/workflows/build_viewer.yml
index 1aeb6d6b0c..5c8697fc82 100644
--- a/.github/workflows/build_viewer.yml
+++ b/.github/workflows/build_viewer.yml
@@ -29,7 +29,7 @@ env:
   fallback_platform: ${platform}
   FS_RELEASE_CHAN: ${FS_RELEASE_TYPE}x64
   FS_GRID: "GRID FLAGS NOT SET"
-  PYTHON: 
+  PYTHON: Unknown
 
 jobs:
   build_matrix:
@@ -38,7 +38,11 @@ jobs:
         os: [macos-15,ubuntu-24.04,windows-2022]
         grid: [sl,os]
         variant: [regular, avx]
+        include:
+          - os: ubuntu-24.04
+            container_image: ubuntu:22.04   # only Linux uses a container
     runs-on: ${{ matrix.os }}
+    container: ${{ matrix.container_image }}
     outputs:
       viewer_channel: ${{ steps.channel.outputs.viewer_channel }}
       viewer_version: ${{ steps.version.outputs.viewer_version }}
@@ -101,12 +105,16 @@ jobs:
         with: 
           swap-storage: false
 
-      # - name: Set gcc version on Linux
-      #   if: runner.os == 'Linux'
-      #   run: |
-      #     echo "CC=gcc-10" >> $GITHUB_ENV
-      #     echo "CXX=g++-10" >> $GITHUB_ENV
-
+      - name: Install GCC-14
+        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
 
       - name: Setup rclone and download the folder
         uses: beqjanus/setup-rclone@main
diff --git a/indra/newview/gltf/asset.cpp b/indra/newview/gltf/asset.cpp
index 28f30ae1c9..e6dd9c1749 100644
--- a/indra/newview/gltf/asset.cpp
+++ b/indra/newview/gltf/asset.cpp
@@ -606,10 +606,10 @@ bool Asset::prep()
 
                                 vertex_count[variant] += primitive.getVertexCount();
                                 index_count[variant] += primitive.getIndexCount();
-
+#ifdef SHOW_ASSERT
                                 // all primitives of a given variant and material should all have the same attribute mask
                                 llassert(attribute_mask == 0 || primitive.mAttributeMask == attribute_mask);
-#ifdef SHOW_ASSERT
+
                                 attribute_mask |= primitive.mAttributeMask;
 #endif
                             }