diff --git a/.github/workflows/ci_steps.yml b/.github/workflows/ci_steps.yml
index 0a1813d67..b80a64961 100644
--- a/.github/workflows/ci_steps.yml
+++ b/.github/workflows/ci_steps.yml
@@ -70,7 +70,7 @@ jobs:
         run: mkdir _install _build _examples
         shell: bash
 
-      - name: Construct CMake command and save it to environment
+      - name: Construct CMake command
         run: |
           CMAKE_COMMAND="cmake -B . -S .. \
                 -DCMAKE_INSTALL_PREFIX=../_install \
@@ -88,6 +88,7 @@ jobs:
                 -DOPENEXR_RUN_FUZZ_TESTS='OFF' \
                 -DCMAKE_VERBOSE_MAKEFILE='ON'"
           echo "CMAKE_COMMAND=$CMAKE_COMMAND" >> $GITHUB_ENV
+          echo "INSTALL_MANIFEST=_build/install_manifest.${{ inputs.os }}.${{ inputs.build }}.txt" >> $GITHUB_ENV
         working-directory: _build
         shell: bash
 
@@ -104,6 +105,18 @@ jobs:
         working-directory: _build
         shell: bash
 
+      - name: Prepare install_manifest
+        run: |
+          echo "# $CMAKE_COMMAND" > $INSTALL_MANIFEST
+          sort _build/install_manifest.txt | sed -e "s:^.*/_install/::" -e ":lib64/:lib/:" >> $INSTALL_MANIFEST
+        shell: bash
+
+      - name: Upload $INSTALL_MANIFEST
+        uses: actions/upload-artifact@v3
+        with:
+          name: install_manifest
+          path: $INSTALL_MANIFEST
+
       - name: Set PATH for Imath/libdeflate DLLs
         if: contains(inputs.os, 'windows')
         run: |
diff --git a/.github/workflows/ci_workflow.yml b/.github/workflows/ci_workflow.yml
index 2c7984fef..ebf06f607 100644
--- a/.github/workflows/ci_workflow.yml
+++ b/.github/workflows/ci_workflow.yml
@@ -107,6 +107,7 @@ jobs:
             vfx-cy: 2021
 
   macOS:
+    if: false
     name: 'macOS.${{ matrix.build}}: ${{ matrix.label }}'
     uses: ./.github/workflows/ci_steps.yml
     with:
@@ -163,6 +164,7 @@ jobs:
             os: macos-12
 
   windows:
+    if: false
     name: 'Windows.${{ matrix.build}}: ${{ matrix.label }}'
     uses: ./.github/workflows/ci_steps.yml
     with: