diff --git a/pkgs/applications/editors/neovim/default.nix b/pkgs/applications/editors/neovim/default.nix
index 28d455e06b26..c55d4b0e76a7 100644
--- a/pkgs/applications/editors/neovim/default.nix
+++ b/pkgs/applications/editors/neovim/default.nix
@@ -17,7 +17,7 @@ let
   version = "2015-06-09";
 
   # Note: this is NOT the libvterm already in nixpkgs, but some NIH silliness:
-  neovimLibvterm = let version = "2015-02-23"; in stdenv.mkDerivation rec {
+  neovimLibvterm = let version = "2015-02-23"; in stdenv.mkDerivation {
     name = "neovim-libvterm-${version}";
 
     src = fetchFromGitHub {
@@ -54,7 +54,7 @@ let
     ignoreCollisions = true;
   };
 
-  neovim = stdenv.mkDerivation rec {
+  neovim = stdenv.mkDerivation {
     name = "neovim-${version}";
 
     src = fetchFromGitHub {
@@ -135,7 +135,7 @@ let
     };
   };
 
-in if (vimAlias == false && configure == null) then neovim else stdenv.mkDerivation rec {
+in if (vimAlias == false && configure == null) then neovim else stdenv.mkDerivation {
   name = "neovim-${version}-configured";
   nativeBuildInputs = [ makeWrapper ];
   buildCommand = ''
diff --git a/pkgs/development/compilers/squeak/default.nix b/pkgs/development/compilers/squeak/default.nix
index 6e68defb6248..7f3ed5c6ec3a 100644
--- a/pkgs/development/compilers/squeak/default.nix
+++ b/pkgs/development/compilers/squeak/default.nix
@@ -2,7 +2,7 @@
 , libpthreadstubs, pango, pkgconfig, libpulseaudio, which }:
 
 let version = "4.10.2.2614"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "squeak-${version}";
 
   src = fetchurl {
diff --git a/pkgs/development/interpreters/picoc/default.nix b/pkgs/development/interpreters/picoc/default.nix
index c9ec01703bf0..290abca5474a 100644
--- a/pkgs/development/interpreters/picoc/default.nix
+++ b/pkgs/development/interpreters/picoc/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub, readline }:
 
 let version = "2015-05-04"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "picoc-${version}";
 
   src = fetchFromGitHub {
diff --git a/pkgs/development/libraries/accounts-qt/default.nix b/pkgs/development/libraries/accounts-qt/default.nix
index 824a29494921..26a04362090c 100644
--- a/pkgs/development/libraries/accounts-qt/default.nix
+++ b/pkgs/development/libraries/accounts-qt/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitLab, doxygen, glib, libaccounts-glib, pkgconfig, qt5 }:
 
 let version = "1.13"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "accounts-qt-${version}";
 
   src = fetchFromGitLab {
diff --git a/pkgs/development/libraries/libcli/default.nix b/pkgs/development/libraries/libcli/default.nix
index bbeb75d0b8dd..a6d564d92946 100644
--- a/pkgs/development/libraries/libcli/default.nix
+++ b/pkgs/development/libraries/libcli/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub }:
 
 let version = "1.9.7"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "libcli-${version}";
 
   src = fetchFromGitHub {
diff --git a/pkgs/development/tools/misc/bin_replace_string/default.nix b/pkgs/development/tools/misc/bin_replace_string/default.nix
index 7d33d8ee3c3d..9e4b77c196e7 100644
--- a/pkgs/development/tools/misc/bin_replace_string/default.nix
+++ b/pkgs/development/tools/misc/bin_replace_string/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, libelf, txt2man }:
 
 let version = "0.2"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "bin_replace_string-${version}";
 
   src = fetchurl {
diff --git a/pkgs/development/tools/parsing/flexc++/default.nix b/pkgs/development/tools/parsing/flexc++/default.nix
index d723cc0382b3..0b9c4fcbc644 100644
--- a/pkgs/development/tools/parsing/flexc++/default.nix
+++ b/pkgs/development/tools/parsing/flexc++/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl, bobcat, icmake, yodl }:
 
 let version = "2.02.00"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "flexc++-${version}";
 
   src = fetchurl {
diff --git a/pkgs/os-specific/linux/freefall/default.nix b/pkgs/os-specific/linux/freefall/default.nix
index 4c1497367e32..34d0f3881e42 100644
--- a/pkgs/os-specific/linux/freefall/default.nix
+++ b/pkgs/os-specific/linux/freefall/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchurl }:
 
 let version = "3.19"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "freefall-${version}";
 
   src = fetchurl {
diff --git a/pkgs/os-specific/linux/jfbview/default.nix b/pkgs/os-specific/linux/jfbview/default.nix
index 34bf136ece78..c89f6e814105 100644
--- a/pkgs/os-specific/linux/jfbview/default.nix
+++ b/pkgs/os-specific/linux/jfbview/default.nix
@@ -5,7 +5,7 @@ let
   version = "0.5.1";
   binaries = [ "jfbpdf" "jfbview" "jpdfcat" "jpdfgrep" ];
 in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "jfbview-${version}";
 
   src = fetchFromGitHub {
diff --git a/pkgs/os-specific/linux/phc-intel/default.nix b/pkgs/os-specific/linux/phc-intel/default.nix
index 4b6569673861..4c47047ff74f 100644
--- a/pkgs/os-specific/linux/phc-intel/default.nix
+++ b/pkgs/os-specific/linux/phc-intel/default.nix
@@ -7,7 +7,7 @@ assert stdenv.lib.versionAtLeast kernel.version "4.0";
 assert !kernel.features ? grsecurity;
 
 let version = "0.4.0-rev17"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "linux-phc-intel-${version}-${kernel.version}";
 
   src = fetchurl {
diff --git a/pkgs/tools/filesystems/duff/default.nix b/pkgs/tools/filesystems/duff/default.nix
index edb69aaef5cf..310153341669 100644
--- a/pkgs/tools/filesystems/duff/default.nix
+++ b/pkgs/tools/filesystems/duff/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub, autoreconfHook, gettext }:
 
 let version = "0.5.2"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "duff-${version}";
 
   src = fetchFromGitHub {
diff --git a/pkgs/tools/filesystems/encfs/default.nix b/pkgs/tools/filesystems/encfs/default.nix
index d85440c5475e..b21054e478df 100644
--- a/pkgs/tools/filesystems/encfs/default.nix
+++ b/pkgs/tools/filesystems/encfs/default.nix
@@ -2,7 +2,7 @@
 , pkgconfig, rlog }:
 
 let version = "1.8.1"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "encfs-${version}";
 
   src = fetchFromGitHub {
diff --git a/pkgs/tools/networking/hans/default.nix b/pkgs/tools/networking/hans/default.nix
index c4f7c8da9d41..31a47d2e4414 100644
--- a/pkgs/tools/networking/hans/default.nix
+++ b/pkgs/tools/networking/hans/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub, nettools }:
 
 let version = "0.4.4"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "hans-${version}";
 
   src = fetchFromGitHub {
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ nettools ];
 
   postPatch = ''
-    substituteInPlace src/tun.cpp --replace "/sbin/" "/${nettools}/bin/"
+    substituteInPlace src/tun.cpp --replace "/sbin/" "${nettools}/bin/"
   '';
 
   enableParallelBuilding = true;
diff --git a/pkgs/tools/security/eid-mw/default.nix b/pkgs/tools/security/eid-mw/default.nix
index e14bc6b9cc4b..c039c41314db 100644
--- a/pkgs/tools/security/eid-mw/default.nix
+++ b/pkgs/tools/security/eid-mw/default.nix
@@ -2,7 +2,7 @@
 , pkgconfig }:
 
 let version = "4.1.4"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "eid-mw-${version}";
 
   src = fetchFromGitHub {
diff --git a/pkgs/tools/security/eid-viewer/default.nix b/pkgs/tools/security/eid-viewer/default.nix
index f2dfd58a7fb1..6df5116ad188 100644
--- a/pkgs/tools/security/eid-viewer/default.nix
+++ b/pkgs/tools/security/eid-viewer/default.nix
@@ -1,9 +1,10 @@
 { stdenv, fetchurl, jre, makeWrapper, pcsclite }:
 
-stdenv.mkDerivation rec {
+let
   # TODO: find out what the version components actually mean, if anything:
   package = "eid-viewer-4.0.7-195";
   build = "tcm406-258907";
+in stdenv.mkDerivation rec {
   name = "${package}-${build}";
 
   src = fetchurl {
diff --git a/pkgs/tools/text/aha/default.nix b/pkgs/tools/text/aha/default.nix
index 4ae8048623c9..d1c21e62a66a 100644
--- a/pkgs/tools/text/aha/default.nix
+++ b/pkgs/tools/text/aha/default.nix
@@ -1,7 +1,7 @@
 { stdenv, fetchFromGitHub }:
 
 let version = "0.4.8"; in
-stdenv.mkDerivation rec {
+stdenv.mkDerivation {
   name = "aha-${version}";
 
   src = fetchFromGitHub {