diff --git a/app/gui/qt/external/CMakeLists.txt b/app/gui/qt/external/CMakeLists.txt
index fe4572658e..a356e5ba9d 100644
--- a/app/gui/qt/external/CMakeLists.txt
+++ b/app/gui/qt/external/CMakeLists.txt
@@ -99,7 +99,7 @@ ExternalProject_Add(libsndfile
         CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${CMAKE_BINARY_DIR}/libsndfile-package
     )
 
-ExternalProject_Add(Aubio
+ExternalProject_Add(aubio
     PREFIX aubio-prefix
     SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/aubio
     DEPENDS libsndfile
@@ -122,4 +122,4 @@ ExternalProject_Add(Aubio
 add_library(AubioBuilder STATIC externals.cpp)
 
 # Dependency ensures the externals are built
-add_dependencies(AubioBuilder Aubio)
+add_dependencies(AubioBuilder aubio)
diff --git a/app/gui/qt/external/unix_build_externals.sh b/app/gui/qt/external/unix_build_externals.sh
index dbc6ad9fd6..59fed90ca2 100644
--- a/app/gui/qt/external/unix_build_externals.sh
+++ b/app/gui/qt/external/unix_build_externals.sh
@@ -6,5 +6,13 @@ echo "Building server external dependencies..."
 mkdir -p "${SCRIPT_DIR}/build"
 cd "${SCRIPT_DIR}/build"
 cmake -G "Unix Makefiles" ..
-cmake --build .
+
+echo "Building osmid..."
+cmake --build . --target osmid
+
+if [ "$1" = "--build-aubio" ]; then
+  echo "Building aubio..."
+  cmake --build . --target aubio
+fi
+
 cd "${SCRIPT_DIR}"
diff --git a/app/gui/qt/external/build_externals.bat b/app/gui/qt/external/win_x64_build_externals.bat
similarity index 100%
rename from app/gui/qt/external/build_externals.bat
rename to app/gui/qt/external/win_x64_build_externals.bat
diff --git a/app/gui/qt/external/build_externals32.bat b/app/gui/qt/external/win_x86_build_externals.bat
similarity index 75%
rename from app/gui/qt/external/build_externals32.bat
rename to app/gui/qt/external/win_x86_build_externals.bat
index 0b0a426fe9..0c76e89b42 100644
--- a/app/gui/qt/external/build_externals32.bat
+++ b/app/gui/qt/external/win_x86_build_externals.bat
@@ -1,6 +1,6 @@
 cd %~dp0
-mkdir build32 > nul
-cd build32
+mkdir build_x86 > nul
+cd build_x86
 cmake -G "Visual Studio 16 2019" -A Win32 ..\
 cmake --build . --config Release
 cd %CURRENT_DIR%
diff --git a/app/gui/qt/unix-prebuild.sh b/app/gui/qt/unix-prebuild.sh
index 15744041f6..45a8f77eb4 100755
--- a/app/gui/qt/unix-prebuild.sh
+++ b/app/gui/qt/unix-prebuild.sh
@@ -4,17 +4,23 @@ SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 echo "Warning: Unix build scripts are still a work in progress!"
 
 # Build external dependencies
-"${SCRIPT_DIR}/external/unix_build_externals.sh"
+if [ "$1" = "--build-aubio" ]; then
+  "${SCRIPT_DIR}/external/unix_build_externals.sh" --build-aubio
+else
+  "${SCRIPT_DIR}/external/unix_build_externals.sh"
+fi
 
 # Install dependencies to server
 echo "Copying external dependencies to the server..."
-mkdir -p "${SCRIPT_DIR}/../../server/native/lib"
-cp "${SCRIPT_DIR}/external/build/aubio-prefix/src/Aubio-build/libaubio-5.so" "${SCRIPT_DIR}/../../server/native/lib/"
-
 mkdir -p "${SCRIPT_DIR}/../../server/native/osmid"
 cp "${SCRIPT_DIR}/external/build/osmid-prefix/src/osmid-build/o2m" "${SCRIPT_DIR}/../../server/native/osmid/"
 cp "${SCRIPT_DIR}/external/build/osmid-prefix/src/osmid-build/m2o" "${SCRIPT_DIR}/../../server/native/osmid/"
 
+if [ "$1" = "--build-aubio" ]; then
+  mkdir -p "${SCRIPT_DIR}/../../server/native/lib"
+  cp "${SCRIPT_DIR}/external/build/aubio-prefix/src/aubio-build/libaubio-5.so" "${SCRIPT_DIR}/../../server/native/lib/"
+fi
+
 #dont remove ruby-aubio-prerelease, as needed in linux build
 #it is removed in the windows-prebuild
 
@@ -25,8 +31,6 @@ ruby "${SCRIPT_DIR}/../../server/ruby/bin/i18n-tool.rb" -t
 
 echo "Generating docs for the Qt GUI..."
 cp "${SCRIPT_DIR}/utils/ruby_help.tmpl" "${SCRIPT_DIR}/utils/ruby_help.h"
-#assumes linux uses system ruby
-#so dont use prefix ../../server/native/ruby/bin/ruby, as unnecessary to set this up
 ruby "${SCRIPT_DIR}/../../server/ruby/bin/qt-doc.rb" -o "${SCRIPT_DIR}/utils/ruby_help.h"
 
 echo "Updating GUI translation files..."
diff --git a/app/gui/qt/win-prebuild.bat b/app/gui/qt/win-prebuild.bat
index 87718a7796..1c3ad0da65 100644
--- a/app/gui/qt/win-prebuild.bat
+++ b/app/gui/qt/win-prebuild.bat
@@ -1,9 +1,9 @@
 cd %~dp0
-call external/build_externals.bat
+call external/win_x64_build_externals.bat
 
 cd %~dp0
 @echo Copying aubio to the server...
-copy external\build\aubio-prefix\src\Aubio-build\Release\libaubio-5.dll ..\..\server\native\ruby\bin
+copy external\build\aubio-prefix\src\aubio-build\Release\libaubio-5.dll ..\..\server\native\ruby\bin
 
 rmdir /S /Q ..\..\server\ruby\vendor\ruby-aubio-prerelease
 rmdir /S /Q ..\..\server\ruby\vendor\fast_osc-1.2.1
diff --git a/app/gui/qt/win-prebuild32.bat b/app/gui/qt/win-prebuild32.bat
index 56abf49720..3dc8728b38 100644
--- a/app/gui/qt/win-prebuild32.bat
+++ b/app/gui/qt/win-prebuild32.bat
@@ -1,14 +1,14 @@
 cd %~dp0
-call external/build_externals32.bat
+call external/win_x86_build_externals.bat
 
 cd %~dp0
 @echo Copying aubio to the server...
-copy external\build32\aubio-prefix\src\Aubio-build\Release\libaubio-5.dll ..\..\server\native\ruby\bin
+copy external\build_x86\aubio-prefix\src\aubio-build\Release\libaubio-5.dll ..\..\server\native\ruby\bin
 
 rmdir /S /Q ..\..\server\ruby\vendor\ruby-aubio-prerelease
 
 @echo Copying osmid to the server
-xcopy /Y /I /R /E external\build32\osmid-prefix\src\osmid-build\Release\*.exe ..\..\server\native\osmid
+xcopy /Y /I /R /E external\build_x86\osmid-prefix\src\osmid-build\Release\*.exe ..\..\server\native\osmid
 
 @echo Copying scsynth to server...
 copy /Y ..\..\..\prebuilt\windows\x86\*.* ..\..\server\native
diff --git a/appveyor.yml b/appveyor.yml
index 1c40397410..36fc4bd202 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,12 +1,19 @@
 # Build worker image (VM template)
-image: Visual Studio 2019
+image:
+  - Visual Studio 2019
+  - macos
+  - Ubuntu
 
 # scripts that are called at very beginning, before repo cloning
 init:
-  - date /T & time /T
-  - git config --global core.autocrlf input
-  - cmake --version
+  - cmd: |
+    date /T & time /T
+    git config --global core.autocrlf input
+    cmake --version
 
+  - sh: |
+    date
+    cmake --version
 branches:
   only:
   - master
@@ -18,37 +25,104 @@ configuration:
   - Release
   - Debug
 
-environment:
-  MSBUILD_FLAGS: /verbosity:minimal /maxcpucount
+# Windows build
+for:
+-
   matrix:
-    - generator: "Visual Studio 16 2019"
+    only:
+      - image: Visual Studio 2019
+
+  environment:
+    MSBUILD_FLAGS: /verbosity:minimal /maxcpucount
+    matrix:
+      - generator: "Visual Studio 16 2019"
+
+  install:
+    - cmd: |
+      cd %APPVEYOR_BUILD_FOLDER%
+      dir
+      cd app\server\native
+      mklink /d ruby c:\Ruby26-x64
+      set PATH=c:\Ruby26-x64\bin;C:\Program Files (x86)\WiX Toolset v3.11\bin;%PATH%
+      gem install win32-process
+      gem install rugged --version 0.27.1
+      gem install aubio
+      gem install fast_osc
+      set QT_INSTALL_LOCATION=C:\Qt\5.14.0\msvc2017_64
+  build_script:
+    # generate build script
+    - cmd: |
+      cd %APPVEYOR_BUILD_FOLDER%
+      cd app\gui\qt
+      win-prebuild.bat
+      win-config.bat
+      cd build
+      cmake --build . --target ALL_BUILD --config %configuration% -- /nologo /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
+  after_build:
+    - cmd: |
+      cd %APPVEYOR_BUILD_FOLDER%
+      cd install\windows
+      IF "%configuration%"=="Release" install.bat
+    #- IF "%configuration%"=="Release" appveyor PushArtifact wix\sonic-pi.msi
+
+# Ubuntu Linux build
+for:
+-
+  matrix:
+    only:
+      - image: Ubuntu
+
+  install:
+    - sh: |
+      cd "$APPVEYOR_BUILD_FOLDER"
+      ls -lA
+      # Install prerequisites
+      sudo apt-get install -y git build-essential\
+       ruby ruby-dev erlang-base\ # Ruby & Erlang stuff
+       qt5-default libqt5svg5-dev\ # Qt5 stuff
+       qttools5-dev qttools5-dev-tools qtdeclarative5-dev libqt5webkit5-dev\
+       qtpositioning5-dev libqt5sensors5-dev libqt5opengl5-dev qtmultimedia5-dev\
+       libjack-jackd2-dev libasound2-dev libavahi-client-dev\ # Other libraries
+       libicu-dev libreadline6-dev libfftw3-dev libxt-dev libudev-dev cmake\
+       libboost-dev libffi-dev
+      gem install bundler
+  build_script:
+    # generate build script
+    - sh: |
+      cd "$APPVEYOR_BUILD_FOLDER"
+      cd app/server/ruby/bin
+      ./compile-extensions.rb
+      cd ../../../gui/qt
+      ./unix-prebuild.sh --build-aubio
+      ./unix-config.sh
+      cd build
+      cmake --build . --target ALL_BUILD
+
+# macOS build
+for:
+-
+  matrix:
+    only:
+      - image: macos
+
+  install:
+    - sh: |
+      cd "$APPVEYOR_BUILD_FOLDER"
+      ls -lA
+      # Install prerequisites
+      brew install cmake erlang qt
+      gem install bundler
+  build_script:
+    # generate build script
+    - sh: |
+      cd "$APPVEYOR_BUILD_FOLDER"
+      cd app/server/ruby/bin
+      ./compile-extensions.rb
+      cd ../../../gui/qt
+      ./unix-prebuild.sh --build-aubio
+      ./unix-config.sh
+      cd build
+      cmake --build . --target ALL_BUILD
 
 matrix:
   fast_finish: true
-
-install:
-  - cd %APPVEYOR_BUILD_FOLDER%
-  - dir
-  - cd app\server\native
-  - mklink /d ruby c:\Ruby26-x64
-  - set PATH=c:\Ruby26-x64\bin;C:\Program Files (x86)\WiX Toolset v3.11\bin;%PATH%
-  - gem install win32-process
-  - gem install rugged --version 0.27.1
-  - gem install aubio
-  - gem install fast_osc
-  - set QT_INSTALL_LOCATION=C:\Qt\5.14.0\msvc2017_64
-
-build_script:
-  # generate build script
-  - cd %APPVEYOR_BUILD_FOLDER%
-  - cd app\gui\qt
-  - win-prebuild.bat
-  - win-config.bat
-  - cd build
-  - cmake --build . --target ALL_BUILD --config %configuration% -- /nologo /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
-
-after_build:
-  - cd %APPVEYOR_BUILD_FOLDER%
-  - cd install\windows
-  - IF "%configuration%"=="Release" install.bat
-  #- IF "%configuration%"=="Release" appveyor PushArtifact wix\sonic-pi.msi