diff --git a/maintainers/scripts/nixpkgs-lint.nix b/maintainers/scripts/nixpkgs-lint.nix
index be2a92509f8..6d99c94bf33 100644
--- a/maintainers/scripts/nixpkgs-lint.nix
+++ b/maintainers/scripts/nixpkgs-lint.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
 
   buildInputs = [ makeWrapper perl perlPackages.XMLSimple ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
   buildPhase = "true";
 
   installPhase =
diff --git a/nixos/lib/testing.nix b/nixos/lib/testing.nix
index a13e76a6956..76706877103 100644
--- a/nixos/lib/testing.nix
+++ b/nixos/lib/testing.nix
@@ -24,7 +24,7 @@ in rec {
 
     buildInputs = [ makeWrapper perl ];
 
-    unpackPhase = "true";
+    dontUnpack = true;
 
     preferLocalBuild = true;
 
diff --git a/nixos/lib/testing/jquery.nix b/nixos/lib/testing/jquery.nix
index 103721cadc3..e272f66a576 100644
--- a/nixos/lib/testing/jquery.nix
+++ b/nixos/lib/testing/jquery.nix
@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
       sha256 = "1v956yf5spw0156rni5z77hzqwmby7ajwdcd6mkhb6zvl36awr90";
     };
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase =
     ''
diff --git a/nixos/modules/services/misc/gitlab.nix b/nixos/modules/services/misc/gitlab.nix
index 71277b48ecd..576ca7bfc05 100644
--- a/nixos/modules/services/misc/gitlab.nix
+++ b/nixos/modules/services/misc/gitlab.nix
@@ -149,7 +149,7 @@ let
     name = "gitlab-rake";
     buildInputs = [ pkgs.makeWrapper ];
     dontBuild = true;
-    unpackPhase = ":";
+    dontUnpack = true;
     installPhase = ''
       mkdir -p $out/bin
       makeWrapper ${cfg.packages.gitlab.rubyEnv}/bin/rake $out/bin/gitlab-rake \
@@ -164,7 +164,7 @@ let
     name = "gitlab-rails";
     buildInputs = [ pkgs.makeWrapper ];
     dontBuild = true;
-    unpackPhase = ":";
+    dontUnpack = true;
     installPhase = ''
       mkdir -p $out/bin
       makeWrapper ${cfg.packages.gitlab.rubyEnv}/bin/rails $out/bin/gitlab-rails \
diff --git a/nixos/modules/virtualisation/openvswitch.nix b/nixos/modules/virtualisation/openvswitch.nix
index 47e07e7432c..edec3740230 100644
--- a/nixos/modules/virtualisation/openvswitch.nix
+++ b/nixos/modules/virtualisation/openvswitch.nix
@@ -54,7 +54,7 @@ in {
     # The path to the an initialized version of the database
     db = pkgs.stdenv.mkDerivation {
       name = "vswitch.db";
-      unpackPhase = "true";
+      dontUnpack = true;
       buildPhase = "true";
       buildInputs = with pkgs; [
         cfg.package
diff --git a/nixos/tests/hydra/default.nix b/nixos/tests/hydra/default.nix
index 882bced86d3..f99b367ac9b 100644
--- a/nixos/tests/hydra/default.nix
+++ b/nixos/tests/hydra/default.nix
@@ -17,7 +17,7 @@ let
 
   createTrivialProject = pkgs.stdenv.mkDerivation {
     name = "create-trivial-project";
-    unpackPhase = ":";
+    dontUnpack = true;
     buildInputs = [ pkgs.makeWrapper ];
     installPhase = "install -m755 -D ${./create-trivial-project.sh} $out/bin/create-trivial-project.sh";
     postFixup = ''
diff --git a/pkgs/applications/editors/emacs-modes/graphviz-dot/default.nix b/pkgs/applications/editors/emacs-modes/graphviz-dot/default.nix
index ce552257133..a08f138bed9 100644
--- a/pkgs/applications/editors/emacs-modes/graphviz-dot/default.nix
+++ b/pkgs/applications/editors/emacs-modes/graphviz-dot/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ emacs ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p "$out/share/emacs/site-lisp"
diff --git a/pkgs/applications/editors/emacs-modes/quack/default.nix b/pkgs/applications/editors/emacs-modes/quack/default.nix
index 29b3a72e9f0..94cb3104ecc 100644
--- a/pkgs/applications/editors/emacs-modes/quack/default.nix
+++ b/pkgs/applications/editors/emacs-modes/quack/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation {
 
   buildInputs = [ emacs ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
   dontConfigure = true;
   installPhase = "true";
 
diff --git a/pkgs/applications/editors/emacs-modes/stgit/default.nix b/pkgs/applications/editors/emacs-modes/stgit/default.nix
index 6460ee53abd..b615accd721 100644
--- a/pkgs/applications/editors/emacs-modes/stgit/default.nix
+++ b/pkgs/applications/editors/emacs-modes/stgit/default.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   pname = "stgit";
   name = "${pname}-2009-10-28";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   src = fetchurl {
     url = "https://raw.githubusercontent.com/miracle2k/stgit/master/contrib/stgit.el";
diff --git a/pkgs/applications/editors/emacs-modes/zeitgeist/default.nix b/pkgs/applications/editors/emacs-modes/zeitgeist/default.nix
index 3461787ab59..9403a51df53 100644
--- a/pkgs/applications/editors/emacs-modes/zeitgeist/default.nix
+++ b/pkgs/applications/editors/emacs-modes/zeitgeist/default.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation {
   name = "zeitgeist-20120221";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   src = fetchurl {
     url = "https://raw.githubusercontent.com/alexmurray/dotfiles/master/.emacs.d/vendor/zeitgeist.el";
diff --git a/pkgs/applications/editors/standardnotes/default.nix b/pkgs/applications/editors/standardnotes/default.nix
index 454b7ad554b..d20f413700e 100644
--- a/pkgs/applications/editors/standardnotes/default.nix
+++ b/pkgs/applications/editors/standardnotes/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ appimage-run ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p $out/{bin,share}
diff --git a/pkgs/applications/editors/yi/wrapper.nix b/pkgs/applications/editors/yi/wrapper.nix
index e20c0a3cbca..a90275638dc 100644
--- a/pkgs/applications/editors/yi/wrapper.nix
+++ b/pkgs/applications/editors/yi/wrapper.nix
@@ -11,7 +11,7 @@ in
 stdenv.mkDerivation rec {
   name = "yi-custom-${version}";
   version = "0.0.0.1";
-  unpackPhase = "true";
+  dontUnpack = true;
   nativeBuildInputs = [ makeWrapper ];
 
   buildCommand = ''
diff --git a/pkgs/applications/graphics/graphicsmagick/compat.nix b/pkgs/applications/graphics/graphicsmagick/compat.nix
index bd1ce2ed893..fedcafc5978 100644
--- a/pkgs/applications/graphics/graphicsmagick/compat.nix
+++ b/pkgs/applications/graphics/graphicsmagick/compat.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   name = "graphicsmagick-imagemagick-compat-${version}";
   inherit (graphicsmagick) version;
 
-  unpackPhase = "true";
+  dontUnpack = true;
   buildPhase = "true";
 
   utils = [
diff --git a/pkgs/applications/misc/jbidwatcher/default.nix b/pkgs/applications/misc/jbidwatcher/default.nix
index 72a24026a89..5939d7789b4 100644
--- a/pkgs/applications/misc/jbidwatcher/default.nix
+++ b/pkgs/applications/misc/jbidwatcher/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation rec {
 
   jarfile = "$out/share/java/${pname}/JBidwatcher.jar";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   dontBuild = true;
 
diff --git a/pkgs/applications/misc/vcal/default.nix b/pkgs/applications/misc/vcal/default.nix
index 7649785524f..5cd8de43729 100644
--- a/pkgs/applications/misc/vcal/default.nix
+++ b/pkgs/applications/misc/vcal/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ perl ]; # for pod2man
 
-  unpackPhase = ":";
+  dontUnpack = true;
   dontBuild = true;
   installPhase = ''
     runHook preInstall
diff --git a/pkgs/applications/networking/browsers/tor-browser-bundle/default.nix b/pkgs/applications/networking/browsers/tor-browser-bundle/default.nix
index b5ceae82ac0..dbe4ddca10f 100644
--- a/pkgs/applications/networking/browsers/tor-browser-bundle/default.nix
+++ b/pkgs/applications/networking/browsers/tor-browser-bundle/default.nix
@@ -77,7 +77,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ tor-browser-unwrapped tor ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   buildPhase = ":";
 
diff --git a/pkgs/applications/networking/browsers/tor-browser-bundle/extensions.nix b/pkgs/applications/networking/browsers/tor-browser-bundle/extensions.nix
index 86c2f53b9ad..bddac77d1d6 100644
--- a/pkgs/applications/networking/browsers/tor-browser-bundle/extensions.nix
+++ b/pkgs/applications/networking/browsers/tor-browser-bundle/extensions.nix
@@ -56,7 +56,7 @@
       sha256 = "1fzspdiwhjabwz1yxb3gzj7giz9jbc1xxm65i93rvhzcp537cs42";
     };
 
-    unpackPhase = ":";
+    dontUnpack = true;
 
     installPhase = ''
       install -m 444 -D $src "$out/$extid.xpi"
diff --git a/pkgs/applications/networking/instant-messengers/rambox/default.nix b/pkgs/applications/networking/instant-messengers/rambox/default.nix
index db488c2f670..eeab5e32c0f 100644
--- a/pkgs/applications/networking/instant-messengers/rambox/default.nix
+++ b/pkgs/applications/networking/instant-messengers/rambox/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ makeWrapper ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   dontWrapGApps = true; # we only want $gappsWrapperArgs here
 
diff --git a/pkgs/applications/networking/instant-messengers/rambox/sencha/default.nix b/pkgs/applications/networking/instant-messengers/rambox/sencha/default.nix
index 1ca04a9e168..4be8edaf9b8 100644
--- a/pkgs/applications/networking/instant-messengers/rambox/sencha/default.nix
+++ b/pkgs/applications/networking/instant-messengers/rambox/sencha/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ makeWrapper ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     makeWrapper ${sencha-bare}/sencha $out/bin/sencha
diff --git a/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix b/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix
index 8f15c08cfc6..7ef42f8ddfd 100644
--- a/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix
+++ b/pkgs/applications/networking/instant-messengers/skypeforlinux/default.nix
@@ -77,7 +77,7 @@ in stdenv.mkDerivation {
 
   buildInputs = [ dpkg ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
   installPhase = ''
     mkdir -p $out
     dpkg -x $src $out
diff --git a/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix b/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix
index 11e2e5baed8..76987d08ff4 100644
--- a/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix
+++ b/pkgs/applications/networking/instant-messengers/slack/dark-theme.nix
@@ -13,7 +13,7 @@ in stdenv.mkDerivation {
     inherit sha256;
   };
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   buildCommand = ''
     mkdir $out
diff --git a/pkgs/applications/networking/instant-messengers/slack/default.nix b/pkgs/applications/networking/instant-messengers/slack/default.nix
index bd1a3956559..6ce33d4f047 100644
--- a/pkgs/applications/networking/instant-messengers/slack/default.nix
+++ b/pkgs/applications/networking/instant-messengers/slack/default.nix
@@ -68,7 +68,7 @@ in stdenv.mkDerivation {
 
   nativeBuildInputs = [ makeWrapper ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
   buildCommand = ''
     mkdir -p $out
     dpkg -x $src $out
diff --git a/pkgs/applications/networking/instant-messengers/viber/default.nix b/pkgs/applications/networking/instant-messengers/viber/default.nix
index d7c70232b0a..a4bf26a0b1a 100644
--- a/pkgs/applications/networking/instant-messengers/viber/default.nix
+++ b/pkgs/applications/networking/instant-messengers/viber/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ dpkg makeWrapper ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   libPath = stdenv.lib.makeLibraryPath [
       alsaLib
diff --git a/pkgs/applications/networking/jnetmap/default.nix b/pkgs/applications/networking/jnetmap/default.nix
index af94db23c0a..8967a5d824a 100644
--- a/pkgs/applications/networking/jnetmap/default.nix
+++ b/pkgs/applications/networking/jnetmap/default.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation rec {
   name = "jnetmap-${version}";
   version = "0.5.4";
-  
+
   src = fetchurl {
     url = "mirror://sourceforge/project/jnetmap/jNetMap%20${version}/jNetMap-${version}.jar";
     sha256 = "0nxsfa600jhazwbabxmr9j37mhwysp0fyrvczhv3f1smiy8rjanl";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ jre makeWrapper ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p "$out/bin"
diff --git a/pkgs/applications/office/jabref/default.nix b/pkgs/applications/office/jabref/default.nix
index 5dfd0357012..ebd5a14ad04 100644
--- a/pkgs/applications/office/jabref/default.nix
+++ b/pkgs/applications/office/jabref/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ makeWrapper jdk wrapGAppsHook gtk3 gsettings-desktop-schemas ];
 
-  unpackPhase = "#";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p $out/bin $out/share/java $out/share/icons
diff --git a/pkgs/applications/office/mendeley/default.nix b/pkgs/applications/office/mendeley/default.nix
index 7ead0fe7348..3c4434f0098 100644
--- a/pkgs/applications/office/mendeley/default.nix
+++ b/pkgs/applications/office/mendeley/default.nix
@@ -103,7 +103,7 @@ stdenv.mkDerivation {
 
   propagatedUserEnvPkgs = [ gconf ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     dpkg-deb -x $src $out
diff --git a/pkgs/applications/science/math/sage/sage-tests.nix b/pkgs/applications/science/math/sage/sage-tests.nix
index 12433e12fe9..591fa192d56 100644
--- a/pkgs/applications/science/math/sage/sage-tests.nix
+++ b/pkgs/applications/science/math/sage/sage-tests.nix
@@ -33,7 +33,7 @@ stdenv.mkDerivation rec {
     sage-with-env
   ];
 
-  unpackPhase = "#do nothing";
+  dontUnpack = true;
   configurePhase = "#do nothing";
   buildPhase = "#do nothing";
 
diff --git a/pkgs/applications/science/math/sage/sage.nix b/pkgs/applications/science/math/sage/sage.nix
index 541b9cb36dc..f6dc21d0018 100644
--- a/pkgs/applications/science/math/sage/sage.nix
+++ b/pkgs/applications/science/math/sage/sage.nix
@@ -11,7 +11,7 @@
 # A wrapper that makes sure sage finds its docs (if they were build) and the
 # jupyter kernel spec.
 
-let 
+let
   # generate kernel spec + default kernels
   kernel-specs = jupyter-kernel.create {
     definitions = jupyter-kernel.default // {
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec {
     sage-tests
   ];
 
-  unpackPhase = "#do nothing";
+  dontUnpack = true;
   configurePhase = "#do nothing";
   buildPhase = "#do nothing";
 
diff --git a/pkgs/build-support/docker/nix-prefetch-docker.nix b/pkgs/build-support/docker/nix-prefetch-docker.nix
index 03a936e08e0..c1d86adc6d8 100644
--- a/pkgs/build-support/docker/nix-prefetch-docker.nix
+++ b/pkgs/build-support/docker/nix-prefetch-docker.nix
@@ -7,7 +7,7 @@ stdenv.mkDerivation {
 
   nativeBuildInputs = [ makeWrapper ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     install -vD ${./nix-prefetch-docker} $out/bin/$name;
diff --git a/pkgs/build-support/rust/fetchcargo.nix b/pkgs/build-support/rust/fetchcargo.nix
index e8465ba6162..4e6058383d4 100644
--- a/pkgs/build-support/rust/fetchcargo.nix
+++ b/pkgs/build-support/rust/fetchcargo.nix
@@ -3,7 +3,7 @@ let cargo-vendor-normalise = stdenv.mkDerivation {
   name = "cargo-vendor-normalise";
   src = ./cargo-vendor-normalise.py;
   nativeBuildInputs = [ python3.pkgs.wrapPython ];
-  unpackPhase = ":";
+  dontUnpack = true;
   installPhase = "install -D $src $out/bin/cargo-vendor-normalise";
   pythonPath = [ python3.pkgs.toml ];
   postFixup = "wrapPythonPrograms";
diff --git a/pkgs/common-updater/scripts.nix b/pkgs/common-updater/scripts.nix
index 8a122b74b23..1bec4a73996 100644
--- a/pkgs/common-updater/scripts.nix
+++ b/pkgs/common-updater/scripts.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation {
 
   buildInputs = [ makeWrapper ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p $out/bin
diff --git a/pkgs/data/fonts/migmix/default.nix b/pkgs/data/fonts/migmix/default.nix
index 9507819fe49..228952aaa56 100644
--- a/pkgs/data/fonts/migmix/default.nix
+++ b/pkgs/data/fonts/migmix/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     find $srcs -name '*.ttf' -exec install -m644 -Dt $out/share/fonts/truetype/migmix {} \;
diff --git a/pkgs/data/fonts/migu/default.nix b/pkgs/data/fonts/migu/default.nix
index 57fbf1a830f..193e98d01a4 100644
--- a/pkgs/data/fonts/migu/default.nix
+++ b/pkgs/data/fonts/migu/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     })
   ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     find $srcs -name '*.ttf' | xargs install -m644 --target $out/share/fonts/truetype/migu -D
diff --git a/pkgs/data/fonts/poly/default.nix b/pkgs/data/fonts/poly/default.nix
index d291d50e836..24155f2ea54 100644
--- a/pkgs/data/fonts/poly/default.nix
+++ b/pkgs/data/fonts/poly/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   sourceRoot = ".";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p $out/share/fonts/opentype
diff --git a/pkgs/data/misc/nixos-artwork/wallpapers.nix b/pkgs/data/misc/nixos-artwork/wallpapers.nix
index 50f874baa4a..3983869a452 100644
--- a/pkgs/data/misc/nixos-artwork/wallpapers.nix
+++ b/pkgs/data/misc/nixos-artwork/wallpapers.nix
@@ -6,7 +6,7 @@ let
     stdenv.mkDerivation {
       inherit name src;
 
-      unpackPhase = "true";
+      dontUnpack = true;
 
       installPhase = ''
         mkdir -p $out/share/artwork/gnome
diff --git a/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/3.1.nix b/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/3.1.nix
index cc71e002632..9728b2f96c4 100644
--- a/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/3.1.nix
+++ b/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/3.1.nix
@@ -17,7 +17,7 @@ in
 stdenv.mkDerivation {
   name = "docbook-sgml-3.1";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   nativeBuildInputs = [ unzip ];
 
diff --git a/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/4.1.nix b/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/4.1.nix
index dc7ebf5959d..78b99081504 100644
--- a/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/4.1.nix
+++ b/pkgs/data/sgml+xml/schemas/sgml-dtd/docbook/4.1.nix
@@ -17,7 +17,7 @@ in
 stdenv.mkDerivation {
   name = "docbook-sgml-4.1";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   nativeBuildInputs = [ unzip ];
 
diff --git a/pkgs/development/compilers/scala/dotty.nix b/pkgs/development/compilers/scala/dotty.nix
index a999bd422e6..7bc7fa3d4c2 100644
--- a/pkgs/development/compilers/scala/dotty.nix
+++ b/pkgs/development/compilers/scala/dotty.nix
@@ -9,7 +9,7 @@ in
 stdenv.mkDerivation {
   name = "dotty-${dotty-bare.version}";
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p $out/bin
diff --git a/pkgs/development/interpreters/jython/default.nix b/pkgs/development/interpreters/jython/default.nix
index 3d82535d29a..f822fdd9c8f 100644
--- a/pkgs/development/interpreters/jython/default.nix
+++ b/pkgs/development/interpreters/jython/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ makeWrapper ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
      mkdir -pv $out/bin
diff --git a/pkgs/development/interpreters/rascal/default.nix b/pkgs/development/interpreters/rascal/default.nix
index 25e125b9af6..22eee0f6ead 100644
--- a/pkgs/development/interpreters/rascal/default.nix
+++ b/pkgs/development/interpreters/rascal/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ makeWrapper jdk ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase =
     ''
diff --git a/pkgs/development/libraries/elf-header/default.nix b/pkgs/development/libraries/elf-header/default.nix
index 47b39eeb7e9..c1764e83c30 100644
--- a/pkgs/development/libraries/elf-header/default.nix
+++ b/pkgs/development/libraries/elf-header/default.nix
@@ -17,7 +17,7 @@ stdenvNoCC.mkDerivation {
 
   src = null;
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   dontBuild = true;
 
diff --git a/pkgs/development/pharo/vm/share.nix b/pkgs/development/pharo/vm/share.nix
index 75ce2ff771c..3bd72434eb3 100644
--- a/pkgs/development/pharo/vm/share.nix
+++ b/pkgs/development/pharo/vm/share.nix
@@ -4,7 +4,7 @@ stdenv.mkDerivation rec {
   version = "1.0";
   name = "pharo-share-${version}";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   sources10Zip = fetchurl {
     url = http://files.pharo.org/sources/PharoV10.sources.zip;
diff --git a/pkgs/development/python-modules/distutils-cfg/default.nix b/pkgs/development/python-modules/distutils-cfg/default.nix
index 204f4de5456..cbf12c17582 100644
--- a/pkgs/development/python-modules/distutils-cfg/default.nix
+++ b/pkgs/development/python-modules/distutils-cfg/default.nix
@@ -21,7 +21,7 @@ in stdenv.mkDerivation {
 
   buildInputs = [ python ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     dest="$out/lib/${python.libPrefix}/site-packages/distutils"
diff --git a/pkgs/development/python-modules/recursive-pth-loader/default.nix b/pkgs/development/python-modules/recursive-pth-loader/default.nix
index 359b482a168..aaa095c5398 100644
--- a/pkgs/development/python-modules/recursive-pth-loader/default.nix
+++ b/pkgs/development/python-modules/recursive-pth-loader/default.nix
@@ -5,7 +5,7 @@ stdenv.mkDerivation rec {
   version = "1.0";
   name = pname + "-" + version;
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   buildInputs = [ python ];
 
diff --git a/pkgs/development/tools/analysis/checkstyle/default.nix b/pkgs/development/tools/analysis/checkstyle/default.nix
index 5b80a5079b6..6ad7ca84a72 100644
--- a/pkgs/development/tools/analysis/checkstyle/default.nix
+++ b/pkgs/development/tools/analysis/checkstyle/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ jre ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     runHook preInstall
diff --git a/pkgs/development/tools/build-managers/leiningen/default.nix b/pkgs/development/tools/build-managers/leiningen/default.nix
index 99692d1ef50..d73683287a1 100644
--- a/pkgs/development/tools/build-managers/leiningen/default.nix
+++ b/pkgs/development/tools/build-managers/leiningen/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
 
   JARNAME = "${name}-standalone.jar";
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   buildInputs = [ makeWrapper ];
   propagatedBuildInputs = [ jdk ];
diff --git a/pkgs/development/tools/build-managers/mill/default.nix b/pkgs/development/tools/build-managers/mill/default.nix
index 7b472c1c4e3..ff49bea526a 100644
--- a/pkgs/development/tools/build-managers/mill/default.nix
+++ b/pkgs/development/tools/build-managers/mill/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ makeWrapper ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
   dontConfigure = true;
   dontBuild = true;
 
diff --git a/pkgs/development/tools/clang-tools/default.nix b/pkgs/development/tools/clang-tools/default.nix
index bd8401ac80d..0fcaee57468 100644
--- a/pkgs/development/tools/clang-tools/default.nix
+++ b/pkgs/development/tools/clang-tools/default.nix
@@ -7,7 +7,7 @@ in
 
 stdenv.mkDerivation {
   name = "clang-tools-${version}";
-  unpackPhase = ":";
+  dontUnpack = true;
   installPhase = ''
     mkdir -p $out/bin
     for tool in \
diff --git a/pkgs/development/tools/database/schemaspy/default.nix b/pkgs/development/tools/database/schemaspy/default.nix
index ab62fdf3d52..128921a67d7 100644
--- a/pkgs/development/tools/database/schemaspy/default.nix
+++ b/pkgs/development/tools/database/schemaspy/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "0ph1l62hy163m2hgybhkccqbcj6brna1vdbr7536zc37lzjxq9rn";
   };
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   buildInputs = [
     jre
diff --git a/pkgs/development/tools/misc/bossa/default.nix b/pkgs/development/tools/misc/bossa/default.nix
index bb81a461188..0d78cfbbab8 100644
--- a/pkgs/development/tools/misc/bossa/default.nix
+++ b/pkgs/development/tools/misc/bossa/default.nix
@@ -7,7 +7,7 @@ let
   bin2c = stdenv.mkDerivation {
     name = "bossa-bin2c";
     src = ./bin2c.c;
-    unpackPhase = "true";
+    dontUnpack = true;
     buildPhase = ''cc $src -o bin2c'';
     installPhase = ''mkdir -p $out/bin; cp bin2c $out/bin/'';
   };
diff --git a/pkgs/development/tools/misc/checkbashisms/default.nix b/pkgs/development/tools/misc/checkbashisms/default.nix
index 2564b42731b..5f98df54c0a 100644
--- a/pkgs/development/tools/misc/checkbashisms/default.nix
+++ b/pkgs/development/tools/misc/checkbashisms/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ perl ];
 
   # The link returns directly the script. No need for unpacking
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     install -D -m755 $src $out/bin/checkbashisms
diff --git a/pkgs/development/tools/parsing/antlr/3.4.nix b/pkgs/development/tools/parsing/antlr/3.4.nix
index ad0ebbdebba..b53116b888e 100644
--- a/pkgs/development/tools/parsing/antlr/3.4.nix
+++ b/pkgs/development/tools/parsing/antlr/3.4.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "1xqbam8vf04q5fasb0m2n1pn5dbp2yw763sj492ncq04c5mqcglx";
   };
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p "$out"/{lib/antlr,bin}
diff --git a/pkgs/development/tools/parsing/antlr/3.5.nix b/pkgs/development/tools/parsing/antlr/3.5.nix
index cf37287beff..4c213ed1c4c 100644
--- a/pkgs/development/tools/parsing/antlr/3.5.nix
+++ b/pkgs/development/tools/parsing/antlr/3.5.nix
@@ -8,7 +8,7 @@ stdenv.mkDerivation rec {
     sha256 = "0srjwxipwsfzmpi0v32d1l5lzk9gi5in8ayg33sq8wyp8ygnbji6";
   };
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p "$out"/{lib/antlr,bin}
diff --git a/pkgs/development/tools/parsing/antlr/4.7.nix b/pkgs/development/tools/parsing/antlr/4.7.nix
index 40f9bf74ac4..e6e54f8dab9 100644
--- a/pkgs/development/tools/parsing/antlr/4.7.nix
+++ b/pkgs/development/tools/parsing/antlr/4.7.nix
@@ -41,7 +41,7 @@ let
       sha256 = "1236gwnzchama92apb2swmklnypj01m7bdwwfvwvl8ym85scw7gl";
     };
 
-    unpackPhase = "true";
+    dontUnpack = true;
 
     installPhase = ''
       mkdir -p "$out"/{share/java,bin}
diff --git a/pkgs/development/tools/selenium/htmlunit-driver/default.nix b/pkgs/development/tools/selenium/htmlunit-driver/default.nix
index 03c3c23c755..a8085399b3d 100644
--- a/pkgs/development/tools/selenium/htmlunit-driver/default.nix
+++ b/pkgs/development/tools/selenium/htmlunit-driver/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
     sha256 = "1sd3cwpamcbq9pv0mvcm8x6minqrlb4i0r12q3jg91girqswm2dp";
   };
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = "install -D $src $out/share/lib/${name}/${name}.jar";
 
diff --git a/pkgs/development/tools/selenium/selendroid/default.nix b/pkgs/development/tools/selenium/selendroid/default.nix
index dcc3893ee0d..82b6d7e1161 100644
--- a/pkgs/development/tools/selenium/selendroid/default.nix
+++ b/pkgs/development/tools/selenium/selendroid/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
   inherit name;
   inherit version;
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   buildInputs = [ jdk makeWrapper ];
 
diff --git a/pkgs/development/tools/selenium/server/default.nix b/pkgs/development/tools/selenium/server/default.nix
index 48bfbdd689b..61b74ce108d 100644
--- a/pkgs/development/tools/selenium/server/default.nix
+++ b/pkgs/development/tools/selenium/server/default.nix
@@ -16,7 +16,7 @@ in stdenv.mkDerivation rec {
     sha256 = "11v340nm8vzqc2bkmbjfm9a7j4dj0bi9bfk8wdpfan0fb8prf772";
   };
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   buildInputs = [ jre makeWrapper ];
 
diff --git a/pkgs/games/runelite/default.nix b/pkgs/games/runelite/default.nix
index 4c06926ed50..a56365778fb 100644
--- a/pkgs/games/runelite/default.nix
+++ b/pkgs/games/runelite/default.nix
@@ -30,7 +30,7 @@
   buildInputs = [ makeWrapper ];
 
   # colon is bash form of no-op (do nothing)
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p $out/share/runelite
diff --git a/pkgs/games/simutrans/default.nix b/pkgs/games/simutrans/default.nix
index a97338f6f20..5cbb3c1796f 100644
--- a/pkgs/games/simutrans/default.nix
+++ b/pkgs/games/simutrans/default.nix
@@ -70,7 +70,7 @@ let
   }:
     stdenv.mkDerivation {
       name = "simutrans-${pakName}";
-      unpackPhase = "true";
+      dontUnpack = true;
       preferLocalBuild = true;
       installPhase = let src = fetchurl { inherit url sha256; };
       in ''
diff --git a/pkgs/misc/cups/drivers/hll2390dw-cups/default.nix b/pkgs/misc/cups/drivers/hll2390dw-cups/default.nix
index 8357a452a2b..55b0deea971 100644
--- a/pkgs/misc/cups/drivers/hll2390dw-cups/default.nix
+++ b/pkgs/misc/cups/drivers/hll2390dw-cups/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ cups ghostscript dpkg a2ps ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     dpkg-deb -x $src $out
diff --git a/pkgs/misc/cups/drivers/mfcj470dwlpr/default.nix b/pkgs/misc/cups/drivers/mfcj470dwlpr/default.nix
index f69c972c999..f31dd9061ec 100644
--- a/pkgs/misc/cups/drivers/mfcj470dwlpr/default.nix
+++ b/pkgs/misc/cups/drivers/mfcj470dwlpr/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ cups ghostscript dpkg a2ps ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     dpkg-deb -x $src $out
diff --git a/pkgs/misc/cups/drivers/mfcj6510dwlpr/default.nix b/pkgs/misc/cups/drivers/mfcj6510dwlpr/default.nix
index e22a159c428..9d9535ce37b 100644
--- a/pkgs/misc/cups/drivers/mfcj6510dwlpr/default.nix
+++ b/pkgs/misc/cups/drivers/mfcj6510dwlpr/default.nix
@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ cups ghostscript dpkg a2ps ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   brprintconf_mfcj6510dw_script = ''
     #!${runtimeShell}
diff --git a/pkgs/misc/emulators/ccemux/default.nix b/pkgs/misc/emulators/ccemux/default.nix
index f3ec6421339..a560ecd0a21 100644
--- a/pkgs/misc/emulators/ccemux/default.nix
+++ b/pkgs/misc/emulators/ccemux/default.nix
@@ -37,7 +37,7 @@ stdenv.mkDerivation rec {
   name = "ccemux-${version}";
 
   src = jar;
-  unpackPhase = "true";
+  dontUnpack = true;
 
   nativeBuildInputs = [ makeWrapper ];
   buildInputs = [ jre ];
diff --git a/pkgs/os-specific/linux/nmon/default.nix b/pkgs/os-specific/linux/nmon/default.nix
index bb00db9868e..a80252d6412 100644
--- a/pkgs/os-specific/linux/nmon/default.nix
+++ b/pkgs/os-specific/linux/nmon/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
   };
 
   buildInputs = [ ncurses ];
-  unpackPhase = ":";
+  dontUnpack = true;
   buildPhase = "cc -o nmon ${src} -g -O2 -D JFS -D GETUSER -Wall -D LARGEMEM -lncurses -lm -g -D X86";
   installPhase = ''
     mkdir -p $out/bin
diff --git a/pkgs/os-specific/linux/rfkill/udev.nix b/pkgs/os-specific/linux/rfkill/udev.nix
index f9d6dc99db8..41dd3da9d31 100644
--- a/pkgs/os-specific/linux/rfkill/udev.nix
+++ b/pkgs/os-specific/linux/rfkill/udev.nix
@@ -34,7 +34,7 @@ let
 in stdenv.mkDerivation {
   name = "rfkill-udev";
 
-  unpackPhase = "true";
+  dontUnpack = true;
   dontBuild = true;
 
   installPhase = ''
diff --git a/pkgs/servers/jetbrains/youtrack.nix b/pkgs/servers/jetbrains/youtrack.nix
index 0518a78f9d6..bbf39e5be46 100644
--- a/pkgs/servers/jetbrains/youtrack.nix
+++ b/pkgs/servers/jetbrains/youtrack.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ makeWrapper ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     runHook preInstall
diff --git a/pkgs/servers/metabase/default.nix b/pkgs/servers/metabase/default.nix
index f8a5ae31ffe..dde0a547693 100644
--- a/pkgs/servers/metabase/default.nix
+++ b/pkgs/servers/metabase/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ makeWrapper ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     makeWrapper ${jre}/bin/java $out/bin/metabase --add-flags "-jar $src"
diff --git a/pkgs/servers/search/elasticsearch/plugins.nix b/pkgs/servers/search/elasticsearch/plugins.nix
index e76d0806114..3a480bd7467 100644
--- a/pkgs/servers/search/elasticsearch/plugins.nix
+++ b/pkgs/servers/search/elasticsearch/plugins.nix
@@ -16,7 +16,7 @@ let
   }:
     stdenv.mkDerivation (a // {
       inherit installPhase;
-      unpackPhase = "true";
+      dontUnpack = true;
       buildInputs = [ unzip ];
       meta = a.meta // {
         platforms = elasticsearch.meta.platforms;
diff --git a/pkgs/test/patch-shebangs/default.nix b/pkgs/test/patch-shebangs/default.nix
index a82e5e1e198..3e68d96004f 100644
--- a/pkgs/test/patch-shebangs/default.nix
+++ b/pkgs/test/patch-shebangs/default.nix
@@ -3,7 +3,7 @@
 let
   bad-shebang = stdenv.mkDerivation {
     name         = "bad-shebang";
-    unpackPhase  = ":";
+    dontUnpack = true;
     installPhase = ''
       mkdir -p $out/bin
       echo "#!/bin/sh" > $out/bin/test
@@ -23,4 +23,4 @@ in runCommand "patch-shebangs-test" {
     echo "no" >&2
     exit 1
   fi
-''
\ No newline at end of file
+''
diff --git a/pkgs/test/stdenv-inputs/default.nix b/pkgs/test/stdenv-inputs/default.nix
index 13fa985839d..4db10e75086 100644
--- a/pkgs/test/stdenv-inputs/default.nix
+++ b/pkgs/test/stdenv-inputs/default.nix
@@ -4,7 +4,7 @@ let
   foo = stdenv.mkDerivation {
     name = "foo-test";
 
-    unpackPhase = ":";
+    dontUnpack = true;
 
     installPhase = ''
       mkdir -p $out/bin $out/include $out/lib
@@ -22,7 +22,7 @@ let
     name = "bar-test";
     outputs = [ "out" "dev" ];
 
-    unpackPhase = ":";
+    dontUnpack = true;
 
     installPhase = ''
       mkdir -p $out/bin $dev/include $dev/lib
diff --git a/pkgs/tools/compression/mozlz4a/default.nix b/pkgs/tools/compression/mozlz4a/default.nix
index 19c160c62f5..9b9de8d8302 100644
--- a/pkgs/tools/compression/mozlz4a/default.nix
+++ b/pkgs/tools/compression/mozlz4a/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
     sha256 = "1d1ai062kdms34bya9dlykkx011rj8d8nh5l7d76xj8k9kv4ssq6";
   };
 
-  unpackPhase = "true;";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p "$out/bin" "$out/${python3.sitePackages}/"
diff --git a/pkgs/tools/graphics/eplot/default.nix b/pkgs/tools/graphics/eplot/default.nix
index a98a5e0aaec..ad8d9ebc6a2 100644
--- a/pkgs/tools/graphics/eplot/default.nix
+++ b/pkgs/tools/graphics/eplot/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ ruby ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p "$out/bin"
diff --git a/pkgs/tools/graphics/zxing/default.nix b/pkgs/tools/graphics/zxing/default.nix
index a760336cfa3..3efb68e60d2 100644
--- a/pkgs/tools/graphics/zxing/default.nix
+++ b/pkgs/tools/graphics/zxing/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     sha256 = "0fzxvvf5dqyrs5m9rqw4ffm9h1s27bi7q3jb1dam34s80q2rp2zq";
   };
   inherit jre;
-  unpackPhase = ''true'';
+  dontUnpack = true;
   installPhase = ''
     mkdir -p "$out/lib/java" "$out/bin"
     cp "${core_jar}" "${javase_jar}" "$out/lib/java"
diff --git a/pkgs/tools/inputmethods/ibus/default.nix b/pkgs/tools/inputmethods/ibus/default.nix
index 31ac23b395c..d2090d77676 100644
--- a/pkgs/tools/inputmethods/ibus/default.nix
+++ b/pkgs/tools/inputmethods/ibus/default.nix
@@ -33,7 +33,7 @@ let
   };
   emojiData = stdenv.mkDerivation {
     name = "emoji-data-5.0";
-    unpackPhase = ":";
+    dontUnpack = true;
     installPhase = ''
       mkdir $out
       ${builtins.toString (flip mapAttrsToList emojiSrcs (k: v: "cp ${v} $out/emoji-${k}.txt;"))}
@@ -62,7 +62,7 @@ let
   };
   ucd = stdenv.mkDerivation rec {
     name = "ucd-12.0.0";
-    unpackPhase = ":";
+    dontUnpack = true;
     installPhase = ''
       mkdir $out
       ${builtins.toString (flip mapAttrsToList ucdSrcs (k: v: "cp ${v} $out/${k}.txt;"))}
diff --git a/pkgs/tools/misc/graylog/plugins.nix b/pkgs/tools/misc/graylog/plugins.nix
index dea71d146ed..a8d571da7eb 100644
--- a/pkgs/tools/misc/graylog/plugins.nix
+++ b/pkgs/tools/misc/graylog/plugins.nix
@@ -14,7 +14,7 @@ let
   }:
     stdenv.mkDerivation (a // {
       inherit installPhase;
-      unpackPhase = "true";
+      dontUnpack = true;
       buildInputs = [ unzip ];
       meta = a.meta // {
         platforms = graylog.meta.platforms;
diff --git a/pkgs/tools/misc/mongodb-compass/default.nix b/pkgs/tools/misc/mongodb-compass/default.nix
index 840d4eacd37..f03b536c615 100644
--- a/pkgs/tools/misc/mongodb-compass/default.nix
+++ b/pkgs/tools/misc/mongodb-compass/default.nix
@@ -57,7 +57,7 @@ in stdenv.mkDerivation {
   inherit src;
 
   buildInputs = [ dpkg ];
-  unpackPhase = "true";
+  dontUnpack = true;
 
   buildCommand = ''
     IFS=$'\n'
diff --git a/pkgs/tools/misc/woof/default.nix b/pkgs/tools/misc/woof/default.nix
index 1fd9f456705..35da2e0a4e9 100644
--- a/pkgs/tools/misc/woof/default.nix
+++ b/pkgs/tools/misc/woof/default.nix
@@ -3,7 +3,7 @@
 stdenv.mkDerivation rec {
   version = "2012-05-31";
   name = "woof-${version}";
-  
+
   src = fetchurl {
     url = "http://www.home.unix-ag.org/simon/woof-${version}.py";
     sha256 = "d84353d07f768321a1921a67193510bf292cf0213295e8c7689176f32e945572";
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
 
   buildInputs = [ python ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase =
     ''
diff --git a/pkgs/tools/misc/x11idle/default.nix b/pkgs/tools/misc/x11idle/default.nix
index c8adff788c7..f4a397ed9dd 100644
--- a/pkgs/tools/misc/x11idle/default.nix
+++ b/pkgs/tools/misc/x11idle/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation {
 
   buildInputs = [ libXScrnSaver libX11 ];
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase = ''
     mkdir -p $out/bin
diff --git a/pkgs/tools/networking/nuttcp/default.nix b/pkgs/tools/networking/nuttcp/default.nix
index 34a34ef903d..2ed9c330181 100644
--- a/pkgs/tools/networking/nuttcp/default.nix
+++ b/pkgs/tools/networking/nuttcp/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     sha256 = "1yang94mcdqg362qbi85b63746hk6gczxrk619hyj91v5763n4vx";
   };
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   buildPhase = ''
     cc -O2 -o nuttcp $src
diff --git a/pkgs/tools/networking/quickserve/default.nix b/pkgs/tools/networking/quickserve/default.nix
index d83784f9989..22589582e3b 100644
--- a/pkgs/tools/networking/quickserve/default.nix
+++ b/pkgs/tools/networking/quickserve/default.nix
@@ -15,7 +15,7 @@ in stdenv.mkDerivation {
   pname = "quickserve";
   version = "2018";
 
-  unpackPhase = ":";
+  dontUnpack = true;
   nativeBuildInputs = [ makeWrapper ];
 
   installPhase = ''
diff --git a/pkgs/tools/package-management/nix-prefetch-scripts/default.nix b/pkgs/tools/package-management/nix-prefetch-scripts/default.nix
index ba47847f28b..c23db106ea1 100644
--- a/pkgs/tools/package-management/nix-prefetch-scripts/default.nix
+++ b/pkgs/tools/package-management/nix-prefetch-scripts/default.nix
@@ -8,7 +8,7 @@ let mkPrefetchScript = tool: src: deps:
 
     nativeBuildInputs = [ makeWrapper ];
 
-    unpackPhase = ":";
+    dontUnpack = true;
 
     installPhase = ''
       install -vD ${src} $out/bin/$name;
diff --git a/pkgs/tools/virtualization/amazon-ecs-cli/default.nix b/pkgs/tools/virtualization/amazon-ecs-cli/default.nix
index 1578a759ec7..f62fdd2f78f 100644
--- a/pkgs/tools/virtualization/amazon-ecs-cli/default.nix
+++ b/pkgs/tools/virtualization/amazon-ecs-cli/default.nix
@@ -9,7 +9,7 @@ stdenv.mkDerivation rec {
     sha256 = "12q167pbpxw38p1bzcy9z4ix7yh9giwkyrc4vq2qln3pjn9d31rj";
   };
 
-  unpackPhase = ":";
+  dontUnpack = true;
 
   installPhase =
     ''
diff --git a/pkgs/tools/virtualization/aws/default.nix b/pkgs/tools/virtualization/aws/default.nix
index 893d4f2aec2..618a45075c9 100644
--- a/pkgs/tools/virtualization/aws/default.nix
+++ b/pkgs/tools/virtualization/aws/default.nix
@@ -2,7 +2,7 @@
 
 stdenv.mkDerivation {
   name = "aws-1.75";
-  
+
   src = fetchurl {
     url = https://raw.github.com/timkay/aws/2f2ff99f9f5111ea708ae6cd14d20e264748e72b/aws;
     sha256 = "0d5asv73a58yb1bb1jpsw3c7asd62y86z5fwpg4llhjzkx79maj6";
@@ -10,7 +10,7 @@ stdenv.mkDerivation {
 
   buildInputs = [ perl ];
 
-  unpackPhase = "true";
+  dontUnpack = true;
 
   installPhase =
     ''
diff --git a/pkgs/top-level/php-packages.nix b/pkgs/top-level/php-packages.nix
index 114b107418d..eb389587c03 100644
--- a/pkgs/top-level/php-packages.nix
+++ b/pkgs/top-level/php-packages.nix
@@ -81,7 +81,7 @@ let
       sha256 = "0hnm7njab9nsifpb1qbwx54yfpsi00g8mzny11s13ibjvd9rnvxn";
     };
 
-    unpackPhase = ":";
+    dontUnpack = true;
 
     nativeBuildInputs = [ pkgs.makeWrapper ];