diff --git a/pkgs/applications/audio/diopser/default.nix b/pkgs/applications/audio/diopser/default.nix
new file mode 100644
index 00000000000..0c97d64945b
--- /dev/null
+++ b/pkgs/applications/audio/diopser/default.nix
@@ -0,0 +1,76 @@
+{ lib, stdenv, fetchFromGitHub, cmake, pkg-config
+, libjack2, alsaLib, freetype, libX11, libXrandr, libXinerama, libXext, libXcursor
+}:
+
+let
+
+  # Derived from subprojects/function2.wrap
+  function2 = rec {
+    version = "4.1.0";
+    src = fetchFromGitHub {
+      owner = "Naios";
+      repo = "function2";
+      rev = version;
+      hash = "sha256-JceZU8ZvtYhFheh8BjMvjjZty4hcYxHEK+IIo5X4eSk=";
+    };
+  };
+
+  juce = rec {
+    version = "unstable-2021-04-07";
+    src = fetchFromGitHub {
+      owner = "juce-framework";
+      repo = "JUCE";
+      rev = "1a5fb5992a1a4e28e998708ed8dce2cc864a30d7";
+      sha256= "1ri7w4sz3sy5xilibg53ls9526fx7jwbv8rc54ccrqfhxqyin308";
+    };
+  };
+
+
+in  stdenv.mkDerivation rec {
+  pname = "diopser";
+  version = "unstable-2021-5-13";
+
+  src = fetchFromGitHub {
+    owner = "robbert-vdh";
+    repo = pname;
+    fetchSubmodules = true;
+    rev = "d5fdc92f1caf5a828e071dac99e106e58f06d84d";
+    sha256 = "06y1h895yxh44gp4vxzrna59lf7nlfw7aacd3kk4l1g56jhy9pdx";
+  };
+
+  postUnpack = ''
+    (
+      cd "$sourceRoot"
+      cp -R --no-preserve=mode,ownership ${function2.src} function2
+      cp -R --no-preserve=mode,ownership ${juce.src} JUCE
+      sed -i 's@CPMAddPackage("gh:juce-framework/JUCE.*@add_subdirectory(JUCE)@g' CMakeLists.txt
+      sed -i 's@CPMAddPackage("gh:Naios/function2.*@add_subdirectory(function2)@g' CMakeLists.txt
+      patchShebangs .
+    )
+  '';
+
+  installPhase = ''
+    mkdir -p $out/lib/vst3
+    cp -r Diopser_artefacts/Release/VST3/Diopser.vst3 $out/lib/vst3
+  '';
+
+  nativeBuildInputs = [ cmake pkg-config ];
+
+  buildInputs = [
+    libjack2 alsaLib freetype libX11 libXrandr libXinerama libXext
+    libXcursor
+  ];
+
+  cmakeFlags = [
+    "-DCMAKE_AR=${stdenv.cc.cc}/bin/gcc-ar"
+    "-DCMAKE_RANLIB=${stdenv.cc.cc}/bin/gcc-ranlib"
+  ];
+
+  meta = with lib; {
+    description = "A totally original phase rotation plugin";
+    homepage = "https://github.com/robbert-vdh/diopser";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ magnetophon ];
+    platforms = platforms.all;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index ec1fefce9c2..3008c27e791 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -1355,6 +1355,8 @@ in
 
   dfmt = callPackage ../tools/text/dfmt { };
 
+  diopser = callPackage ../applications/audio/diopser { };
+
   diskonaut = callPackage ../tools/misc/diskonaut { };
 
   diskus = callPackage ../tools/misc/diskus {