diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 000000000..758b38eef
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,316 @@
+name: Build Audacity
+
+on:
+  push:
+    # Remove the "#" from the next 2 lines if you need to disable this action
+    #branches:
+    #  - disable
+
+jobs:
+  build:
+    # =========================================================================
+    # Run asynchronous builds
+    # =========================================================================
+    strategy:
+        fail-fast: false
+        matrix:
+            os: [windows-2019, ubuntu-16.04, ubuntu-18.04, macos-latest]
+            #os: [macos-latest]
+
+    runs-on: ${{ matrix.os }}
+
+    env:
+      USE_AUDACITY_WX: true
+
+    steps:
+    # =========================================================================
+    # SHARED: Checkout source
+    # =========================================================================
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        ref: master
+
+    # =========================================================================
+    # SHARED: Retrieve the commit hash and generate revision header
+    # =========================================================================
+    - name: Generate Header
+      shell: bash
+      run: |
+        set -x
+
+        # Generate the revision header
+        git show -s --format="#define REV_LONG \"%H\"%n#define REV_TIME \"%cd\"%n" >src/RevisionIdent.h
+
+        # Export the long and short hashs to further steps
+        echo "::set-env name=LONGHASH::$(git show -s --format='%H')"
+        echo "::set-env name=SHORTHASH::$(git show -s --format='%h')"
+
+    # =========================================================================
+    # SHARED: Retrieve the wxWidgets source and export the commit hash
+    # =========================================================================
+    - name: wxWidgets Hash
+      shell: bash
+      run: |
+        set -x
+
+        # Get latest wxWidgets source
+        git clone --depth 1 -n https://github.com/audacity/wxWidgets
+        cd wxWidgets
+
+        # Export the commit hash to further steps
+        echo "::set-env name=WXHASH::$(git show -s --format='%H')"
+
+    # =========================================================================
+    # SHARED: Create and/or retrieve wxWidgets cached build
+    # =========================================================================
+    - name: Cache wxWidgets
+      uses: actions/cache@v1
+      with:
+        key: wxWidgets_${{ matrix.os }}_${{ env.WXHASH }}.8
+        path: wxroot
+
+    # =========================================================================
+    # WINDOWS: Setup Nuget (for all versions of Ubuntu) 
+    # =========================================================================
+    - name: Setup Nuget
+      uses: nuget/setup-nuget@v1
+      if: startswith( matrix.os, 'windows' )
+
+    # =========================================================================
+    # WINDOWS: Build (for all versions of Ubuntu)
+    # =========================================================================
+    - name: Build Windows
+      if: startswith( matrix.os, 'windows' )
+      shell: cmd
+      run: |
+        :: Set up Visual Studio environment
+        CALL "C:\Program Files (x86)\Microsoft Visual Studio\2019\Enterprise\VC\Auxiliary\Build\vcvars32.bat"
+        ECHO ON
+
+        :: Setup environment
+        choco install zip
+
+        :: Identify wxWidgets installation directory
+        SET WXWIN=%GITHUB_WORKSPACE%\wxroot
+
+        :: Build wxWidgets if needed
+        IF NOT EXIST %WXWIN% (
+            MKDIR %WXWIN%
+
+            CD wxWidgets
+            git checkout
+            git submodule update --init
+
+            :: Build it
+            CD build\msw
+            nmake -f makefile.vc BUILD=release SHARED=1
+            IF NOT %ERRORLEVEL% == 0 EXIT %ERRORLEVEL%
+            CD ..\..
+
+            :: "Install" wxWidgets
+            XCOPY include %WXWIN%\include /E /I /Q /Y
+            XCOPY lib %WXWIN%\lib /E /I /Q /Y
+            XCOPY locale %WXWIN%\locale /E /I /Q /Y
+            XCOPY src %WXWIN%\src /E /I /Q /Y
+
+            CD ..
+        )
+
+        :: Build Audacity
+        CD win
+
+        :: Restore packages (for gettext)
+        nuget restore audacity.sln
+
+        :: Build solution
+        msbuild audacity.sln /m /p:Configuration=Release /p:Platform=Win32
+        IF NOT %ERRORLEVEL% == 0 EXIT %ERRORLEVEL%
+
+        :: "Install" Audacity
+        MKDIR "%LONGHASH%"
+        XCOPY Release "%LONGHASH%" /E /I /Q /Y
+        XCOPY %WXWIN%\lib\vc_dll\*u_net_*.dll "%LONGHASH%" /E /I /Q /Y
+        XCOPY %WXWIN%\lib\vc_dll\*u_vc_*.dll "%LONGHASH%" /E /I /Q /Y
+        XCOPY %WXWIN%\lib\vc_dll\*u_xml_*.dll "%LONGHASH%" /E /I /Q /Y
+        XCOPY %WXWIN%\lib\vc_dll\*u_adv_*.dll "%LONGHASH%" /E /I /Q /Y
+        XCOPY %WXWIN%\lib\vc_dll\*u_core_*.dll "%LONGHASH%" /E /I /Q /Y
+        XCOPY %WXWIN%\lib\vc_dll\*u_html_*.dll "%LONGHASH%" /E /I /Q /Y
+        XCOPY %WXWIN%\lib\vc_dll\*u_qa_*.dll "%LONGHASH%" /E /I /Q /Y
+        CD "%LONGHASH%"
+        DEL /Q /S *.iobj *.exp *.ilk *.lib *.ipdb *.pdb include
+        #CD ..
+
+        :: Create artifact
+        
+        zip -r9 "..\..\%LONGHASH%.zip" *
+
+    # =========================================================================
+    # UBUNTU: Build (for all versions of Ubuntu)
+    # =========================================================================
+    - name: Build Ubuntu
+      if: startswith( matrix.os, 'ubuntu' )
+      shell: bash
+      run: |
+        set -x
+        set
+
+        # Setup environment
+        sudo apt-get install -y libgtk2.0-dev libasound2-dev autoconf automake zip
+
+        # Identify wxWidgets installation directory
+        WXROOT="${GITHUB_WORKSPACE}/wxroot"
+
+        # Build wxWidgets if needed
+        if [ ! -e "${WXROOT}" ]
+        then
+            mkdir "${WXROOT}"
+
+            cd wxWidgets
+            git checkout
+            git submodule update --init
+
+            ./configure --with-gtk
+            make -j $(nproc) install DESTDIR="${WXROOT}"
+
+            cd ..
+        fi
+
+        # "Install" wxWidgets
+        sudo cp -a "${WXROOT}"/* /
+
+        # Configure Audacity
+        mkdir bld
+        cd bld
+        ../configure --with-lib-preference='local system'
+
+        # Build lib-src first
+        #
+        # This allows using multiple make jobs (-j).  If not done this way
+        # the build may fail (bug in our make process)
+        cd lib-src
+        make -j $(nproc)
+        cd ..
+
+        # And then the rest
+        make -j $(nproc)
+
+        # Identify installation directory
+        DESTDIR="$(pwd)/linux"
+        mkdir -p "${DESTDIR}"
+
+        # Create wrapper script
+        #
+        # (This is only needed if using our wxWidgets libs)
+        cat >"${DESTDIR}/audacity" <<"EOF"
+        #!/bin/sh
+        export LD_LIBRARY_PATH="${0%/*}:${LD_LIBRARY_PATH}"
+        "${0%/*}/audacity.bin"
+        EOF
+        chmod +x "${DESTDIR}/audacity"
+
+        # Copy over dist files
+        cp -a audacity "${DESTDIR}/audacity.bin"
+        cp -aL nyquist plug-ins "${DESTDIR}"
+        mkdir "${DESTDIR}/help" "${DESTDIR}/locale/"
+        cp -aL $(find locale/ -type d) "${DESTDIR}/locale/"
+
+        # Copy wxWidgets libraries
+        cp -a "${WXROOT}"/usr/local/lib/*.so* "${DESTDIR}"
+
+        # Create artifact (zipped as Github actions don't preserve permissions)
+        cd "${DESTDIR}"
+        zip -r9 "${GITHUB_WORKSPACE}/${LONGHASH}.zip" *
+
+    # =========================================================================
+    # MACOS: Build (for all versions of MacOS)
+    # =========================================================================
+    - name: Build Mac
+      if: startswith( matrix.os, 'macos' )
+      shell: bash
+      run: |
+        set -x
+
+        # The minimum OS X version supported by Audacity is 10.7.
+        minver=10.7
+
+        # Make the "msgfmt" command available
+        brew install gettext
+        brew link --force gettext
+
+        # Make sure MacOS supplied commands are used
+        export PATH="/usr/bin:/usr/sbin:/bin:/sbin:/usr/local/bin"
+
+        # Identify wxWidgets installation directory
+        WXROOT="${GITHUB_WORKSPACE}/wxroot"
+
+        # Build wxWidgets if needed
+        if [ ! -e "${WXROOT}" ]
+        then
+            mkdir "${WXROOT}"
+
+            cd wxWidgets
+            git checkout
+            git submodule update --init
+
+            # Make sure our flags are included
+            export CXX="g++ -std=c++1z -stdlib=libc++"
+            export LD="g++ -std=c++1z -stdlib=libc++"
+
+            # Build x86_64, release, shared configuration
+            ./configure --prefix=/usr/local/x86_64 \
+                        --enable-debug=no \
+                        --enable-macosx-arch="x86_64" \
+                        --enable-shared=yes \
+                        --enable-unicode=yes \
+                        --enable-universal_binary=no \
+                        --enable-webkit=no \
+                        --enable-webviewwebkit=no \
+                        --with-expat=builtin \
+                        --with-flavour="release" \
+                        --with-libjpeg=builtin \
+                        --with-libpng=builtin \
+                        --with-libtiff=builtin \
+                        --with-macosx-version-min="${minver}" \
+                        --with-regex=builtin \
+                        --with-zlib=builtin \
+                        --without-liblzma
+
+            ${run} make -j $(sysctl -n hw.ncpu) install DESTDIR="${WXROOT}"
+
+            unset CXX LD
+
+            cd ..
+        fi
+
+        # "Install" wxWidgets
+        sudo cp -a "${WXROOT}/usr/local" /usr/
+
+        # Build Audacity
+        cd mac
+
+        # Temporary workaround until they can be incorporated into
+        # the Xcode project itself
+        sed -i '' -e "s/TARGET=10.9/TARGET=${minver}/g" \
+                  -e "s/macosx10.9/macosx/g" Audacity.xcodeproj/project.pbxproj
+
+        xcodebuild -configuration Release64 install 
+        cd ..
+
+        # "Install" Audacity
+        mkdir -p macos
+        cp -a /tmp/Audacity.dst/Audacity.app macos
+        
+        # Create artifact (zipped as Github actions don't preserve permissions)
+        cd "/tmp/Audacity.dst"
+        zip -r9 "${GITHUB_WORKSPACE}/${LONGHASH}.zip" *
+
+    # =========================================================================
+    # SHARED: Attach the artifact to the workflow results
+    # =========================================================================
+    - name: Upload artifact
+      uses: actions/upload-artifact@v1
+      with:
+        name: ${{ matrix.os }}_${{ env.SHORTHASH }}
+        path: ${{ env.LONGHASH }}.zip
+