diff --git a/.github/workflows/autobuild.yml b/.github/workflows/autobuild.yml
index d6fb37e932..6131504d9c 100644
--- a/.github/workflows/autobuild.yml
+++ b/.github/workflows/autobuild.yml
@@ -111,7 +111,7 @@ jobs:
            - config_name:           MacOS (codeQL)
              target_os:             macos
              building_on_os:        macos-10.15
-             cmd1_prebuild:         "./autobuild/mac/codeQL/autobuild_mac_1_prepare.sh"
+             cmd1_prebuild:         "./autobuild/mac/codeQL/autobuild_mac_1_prepare.sh 5.15.2"
              cmd2_build:            "./autobuild/mac/codeQL/autobuild_mac_2_build.sh"
              cmd3_postbuild:        false
              uses_codeql:           true
@@ -119,11 +119,19 @@ jobs:
            - config_name:           MacOS (artifacts)
              target_os:             macos
              building_on_os:        macos-10.15
-             cmd1_prebuild:         "./autobuild/mac/artifacts/autobuild_mac_1_prepare.sh"
+             cmd1_prebuild:         "./autobuild/mac/artifacts/autobuild_mac_1_prepare.sh 5.15.2"
              cmd2_build:            "./autobuild/mac/artifacts/autobuild_mac_2_build.sh"
              cmd3_postbuild:        "./autobuild/mac/artifacts/autobuild_mac_3_copy_files.sh"
              uses_codeql:           false
 
+           - config_name:           MacOS Legacy (artifacts)
+             target_os:             macos
+             building_on_os:        macos-10.15
+             cmd1_prebuild:         "./autobuild/mac/artifacts/autobuild_mac_1_prepare.sh 5.9.9"
+             cmd2_build:            "./autobuild/mac/artifacts/autobuild_mac_2_build.sh"
+             cmd3_postbuild:        "./autobuild/mac/artifacts/autobuild_mac_3_copy_files.sh legacy"
+             uses_codeql:           false
+
            - config_name:           Windows (artifact+codeQL)
              target_os:             windows
              building_on_os:        windows-latest
diff --git a/autobuild/mac/artifacts/autobuild_mac_1_prepare.sh b/autobuild/mac/artifacts/autobuild_mac_1_prepare.sh
index 3f59b370a8..48642db6a1 100755
--- a/autobuild/mac/artifacts/autobuild_mac_1_prepare.sh
+++ b/autobuild/mac/artifacts/autobuild_mac_1_prepare.sh
@@ -2,16 +2,23 @@
 
 # autobuild_1_prepare: set up environment, install Qt & dependencies
 
+if [ "$#" -ne "1" ]; then
+    echo "need to specify Qt version"
+    exit 1
+fi
+
+QT_VER=$1
+
 ###################
 ###  PROCEDURE  ###
 ###################
 
 echo "Install dependencies..."
 python3 -m pip install aqtinstall
-python3 -m aqt install --outputdir /usr/local/opt/qt 5.12.10 mac desktop
+python3 -m aqt install --outputdir /usr/local/opt/qt ${QT_VER} mac desktop
 
 # add the qt binaries to the path
-export -p PATH=/usr/local/opt/qt/5.12.10/clang_64/bin:"${PATH}"
+export -p PATH=/usr/local/opt/qt/${QT_VER}/clang_64/bin:"${PATH}"
 echo "::set-env name=PATH::${PATH}"
 echo "the path is ${PATH}"
 
diff --git a/autobuild/mac/artifacts/autobuild_mac_3_copy_files.sh b/autobuild/mac/artifacts/autobuild_mac_3_copy_files.sh
index 64dd55d690..32f4205e00 100755
--- a/autobuild/mac/artifacts/autobuild_mac_3_copy_files.sh
+++ b/autobuild/mac/artifacts/autobuild_mac_3_copy_files.sh
@@ -2,6 +2,10 @@
 
 # autobuild_3_copy_files: copy the built files to deploy folder
 
+if [ "$#" -gt 1 ]; then
+    BUILD_SUFFIX=_$1
+    shift
+fi
 
 ####################
 ###  PARAMETERS  ###
@@ -23,7 +27,7 @@ echo ""
 
 echo ""
 echo ""
-artifact_deploy_filename=jamulus_${jamulus_buildversionstring}_mac.dmg
+artifact_deploy_filename=jamulus_${jamulus_buildversionstring}_mac${BUILD_SUFFIX}.dmg
 echo "Move/Rename the built file to deploy/${artifact_deploy_filename}"
 mv "${THIS_JAMULUS_PROJECT_PATH}"/deploy/Jamulus-*installer-mac.dmg "${THIS_JAMULUS_PROJECT_PATH}"/deploy/"${artifact_deploy_filename}"
 
diff --git a/autobuild/mac/codeQL/autobuild_mac_1_prepare.sh b/autobuild/mac/codeQL/autobuild_mac_1_prepare.sh
index 1872decd24..a12262bb05 100755
--- a/autobuild/mac/codeQL/autobuild_mac_1_prepare.sh
+++ b/autobuild/mac/codeQL/autobuild_mac_1_prepare.sh
@@ -2,16 +2,23 @@
 
 # autobuild_1_prepare: set up environment, install Qt & dependencies
 
+if [ "$#" -ne "1" ]; then
+    echo "need to specify Qt version"
+    exit 1
+fi
+
+QT_VER=$1
+
 ###################
 ###  PROCEDURE  ###
 ###################
 
 echo "Install dependencies..."
 python3 -m pip install aqtinstall
-python3 -m aqt install --outputdir /usr/local/opt/qt 5.12.10 mac desktop
+python3 -m aqt install --outputdir /usr/local/opt/qt ${QT_VER} mac desktop
 
 # add the qt binaries to the path
-export -p PATH=/usr/local/opt/qt/5.12.10/clang_64/bin:"${PATH}"
+export -p PATH=/usr/local/opt/qt/${QT_VER}/clang_64/bin:"${PATH}"
 echo "::set-env name=PATH::${PATH}"
 echo "the path is ${PATH}"