diff --git a/.github/scripts/macOS/prepare.sh b/.github/scripts/macOS/prepare.sh
index e10440e89..b1861ffc2 100755
--- a/.github/scripts/macOS/prepare.sh
+++ b/.github/scripts/macOS/prepare.sh
@@ -3,10 +3,12 @@
 AJA_INST=/var/tmp/ntv2sdk # AJA installation directory
 TEMP_INST=/tmp/install
 
+CPATH=/usr/local/include:/usr/local/opt/qt/include
+LIBRARY_PATH=/usr/local/lib:/usr/local/opt/qt/lib
 echo "::set-env name=AJA_DIRECTORY::$AJA_INST"
 echo "::set-env name=UG_SKIP_NET_TESTS::1"
-echo "::set-env name=CPATH::/usr/local/include:/usr/local/opt/qt/include"
-echo "::set-env name=LIBRARY_PATH::/usr/local/lib:/usr/local/opt/qt/lib"
+echo "::set-env name=CPATH::$CPATH"
+echo "::set-env name=LIBRARY_PATH::$LIBRARY_PATH"
 # libcrypto.pc (and other libcrypto files) is not linked to /usr/local/{lib,include} because conflicting with system libcrypto
 echo "::set-env name=PKG_CONFIG_PATH::/usr/local/lib/pkgconfig:/usr/local/opt/qt/lib/pkgconfig:/usr/local/opt/openssl/lib/pkgconfig"
 echo "::add-path::/usr/local/opt/qt/bin"
@@ -42,6 +44,23 @@ if [ -n "$sdk_pass" ]; then
         cd $TEMP_INST
 fi
 
+# Install NDI
+if [ -n "$sdk_pass" -a "$GITHUB_REF" = refs/heads/ndi-build ]; then
+        curl --netrc-file <(cat <<<"machine frakira.fi.muni.cz login sdk password $sdk_pass") https://frakira.fi.muni.cz/~xpulec/sdks/NDISDK_Apple.pkg -O
+        sudo installer -pkg NDISDK_Apple.pkg -target /
+        rm NDISDK_Apple.pkg
+        sudo ln -s "/Library/NDI SDK for Apple/" /Library/NDI
+        cd /Library/NDI/lib/x64
+        sudo ln -s libndi.?.dylib libndi.dylib
+        export CPATH=${CPATH:+"$CPATH:"}/Library/NDI/include
+        export LIBRARY_PATH=${LIBRARY_PATH:+"$LIBRARY_PATH:"}/Library/NDI/lib/x64
+        export DYLD_LIBRARY_PATH=${DYLD_LIBRARY_PATH:+"$DYLD_LIBRARY_PATH:"}/Library/NDI/lib/x64
+        echo "::set-env name=CPATH::$CPATH"
+        echo "::set-env name=LIBRARY_PATH::$LIBRARY_PATH"
+        echo "::set-env name=DYLD_LIBRARY_PATH::$DYLD_LIBRARY_PATH"
+        cd $TEMP_INST
+fi
+
 # Install live555
 git clone https://github.com/xanview/live555/
 cd live555
diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 5e60fdbbf..3f67e8aaa 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -118,7 +118,7 @@ jobs:
     - name: bootstrap
       run: .github/scripts/macOS/prepare.sh
     - name: configure
-      run: ARCH=-msse4.2 ./autogen.sh --enable-qt --with-live555=/usr/local
+      run: "export ARCH=-msse4.2; [ ${{ github.ref }} != refs/heads/ndi-build ] && NDI=-disable-ndi; ./autogen.sh --enable-qt --with-live555=/usr/local $NDI"
     - name: make bundle
       run: make -j4 gui-bundle
     - name: sign+notarize