diff --git a/lib/platforms.nix b/lib/platforms.nix
index 76df389deac..44a56b659c7 100644
--- a/lib/platforms.nix
+++ b/lib/platforms.nix
@@ -11,6 +11,6 @@ rec {
   unix = linux ++ darwin ++ freebsd ++ openbsd;
   all = linux ++ darwin ++ cygwin ++ freebsd ++ openbsd;
   none = [];
-  allBut = platform: lists.filter (x: platform != x) all;
+  allBut = platforms: lists.filter (x: !(builtins.elem x platforms)) all;
   mesaPlatforms = ["i686-linux" "x86_64-linux" "x86_64-darwin" "armv5tel-linux" "armv6l-linux"];
 }
diff --git a/pkgs/development/compilers/chicken/default.nix b/pkgs/development/compilers/chicken/default.nix
index 17bf12f9e5f..8fd99973cbc 100644
--- a/pkgs/development/compilers/chicken/default.nix
+++ b/pkgs/development/compilers/chicken/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation {
     homepage = http://www.call-cc.org/;
     license = "BSD";
     maintainers = with stdenv.lib.maintainers; [ the-kenny ];
-    platforms = stdenv.lib.platforms.allBut "x86_64-darwin";
+    platforms = with stdenv.lib.platforms; allBut darwin;
     description = "A portable compiler for the Scheme programming language";
     longDescription = ''
       CHICKEN is a compiler for the Scheme programming language.
diff --git a/pkgs/development/libraries/buddy/default.nix b/pkgs/development/libraries/buddy/default.nix
index 3cfa2a25021..d23b2f27c07 100644
--- a/pkgs/development/libraries/buddy/default.nix
+++ b/pkgs/development/libraries/buddy/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
     description = "binary decision diagram package";
     license = "as-is";
 
-    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
+    platforms = with stdenv.lib.platforms; allBut cygwin;
     maintainers = [ stdenv.lib.maintainers.simons ];
   };
 }
diff --git a/pkgs/development/libraries/cln/default.nix b/pkgs/development/libraries/cln/default.nix
index f536e746d0e..982deb29ea8 100644
--- a/pkgs/development/libraries/cln/default.nix
+++ b/pkgs/development/libraries/cln/default.nix
@@ -14,6 +14,6 @@ stdenv.mkDerivation rec {
     description = "C/C++ library for numbers, a part of GiNaC";
     homepage = http://www.ginac.de/CLN/;
     maintainers = [ stdenv.lib.maintainers.urkud ];
-    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
+    platforms = with stdenv.lib.platforms; allBut cygwin;
   };
 }
diff --git a/pkgs/development/libraries/cloog-ppl/default.nix b/pkgs/development/libraries/cloog-ppl/default.nix
index d84baedf96e..6f938680d7e 100644
--- a/pkgs/development/libraries/cloog-ppl/default.nix
+++ b/pkgs/development/libraries/cloog-ppl/default.nix
@@ -74,6 +74,6 @@ stdenv.mkDerivation rec {
        make[3]: *** [Box.lo] Error 1
 
     */
-    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
+    platforms = with stdenv.lib.platforms; allBut cygwin;
   };
 }
diff --git a/pkgs/development/libraries/cloog/default.nix b/pkgs/development/libraries/cloog/default.nix
index 205f4d83693..da4501285e1 100644
--- a/pkgs/development/libraries/cloog/default.nix
+++ b/pkgs/development/libraries/cloog/default.nix
@@ -58,6 +58,6 @@ stdenv.mkDerivation rec {
        make[3]: *** [Box.lo] Error 1
 
     */
-    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
+    platforms = with stdenv.lib.platforms; allBut cygwin;
   };
 }
diff --git a/pkgs/development/libraries/commoncpp2/default.nix b/pkgs/development/libraries/commoncpp2/default.nix
index 348f7bdfb66..9dff8a6c50f 100644
--- a/pkgs/development/libraries/commoncpp2/default.nix
+++ b/pkgs/development/libraries/commoncpp2/default.nix
@@ -35,6 +35,6 @@ stdenv.mkDerivation rec {
     maintainers = [ stdenv.lib.maintainers.marcweber
                     stdenv.lib.maintainers.ludo
                   ];
-    platforms = stdenv.lib.platforms.allBut "i686-freebsd";
+    platforms = with stdenv.lib.platforms; allBut freebsd;
   };
 }
diff --git a/pkgs/misc/screensavers/xscreensaver/default.nix b/pkgs/misc/screensavers/xscreensaver/default.nix
index 7afe895cb5c..04791749810 100644
--- a/pkgs/misc/screensavers/xscreensaver/default.nix
+++ b/pkgs/misc/screensavers/xscreensaver/default.nix
@@ -40,6 +40,6 @@ stdenv.mkDerivation rec {
     homepage = "http://www.jwz.org/xscreensaver/";
     description = "A set of screensavers";
     maintainers = with stdenv.lib.maintainers; [ raskin urkud ];
-    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
+    platforms = with stdenv.lib.platforms; allBut cygwin;
   };
 }
diff --git a/pkgs/tools/graphics/dcraw/default.nix b/pkgs/tools/graphics/dcraw/default.nix
index b8d8dd5f48a..72b50bd4e77 100644
--- a/pkgs/tools/graphics/dcraw/default.nix
+++ b/pkgs/tools/graphics/dcraw/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     homepage = http://www.cybercom.net/~dcoffin/dcraw/;
     description = "Decoder for many camera raw picture formats";
     license = "free";
-    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
+    platforms = with stdenv.lib.platforms; allBut cygwin;
     maintainers = [ stdenv.lib.maintainers.urkud ];
   };
 }
diff --git a/pkgs/tools/system/acct/default.nix b/pkgs/tools/system/acct/default.nix
index 071504368b7..0bea6bec354 100644
--- a/pkgs/tools/system/acct/default.nix
+++ b/pkgs/tools/system/acct/default.nix
@@ -25,6 +25,6 @@ stdenv.mkDerivation rec {
     homepage = http://www.gnu.org/software/acct/;
 
     maintainers = [ ];
-    platforms = stdenv.lib.platforms.allBut "i686-cygwin";
+    platforms = with stdenv.lib.platforms; allBut cygwin;
   };
 }
diff --git a/pkgs/top-level/release-small.nix b/pkgs/top-level/release-small.nix
index 341f12cbe47..c447587e36e 100644
--- a/pkgs/top-level/release-small.nix
+++ b/pkgs/top-level/release-small.nix
@@ -23,7 +23,7 @@ with import ./release-lib.nix { inherit supportedSystems; };
   aterm28 = all;
   autoconf = all;
   automake = all;
-  avahi = allBut "i686-cygwin";  # Cygwin builds fail
+  avahi = allBut cygwin;  # Cygwin builds fail
   bash = all;
   bashInteractive = all;
   bc = all;
@@ -59,7 +59,7 @@ with import ./release-lib.nix { inherit supportedSystems; };
   gnumake = all;
   gnupatch = all;
   gnupg = linux;
-  gnuplot = allBut "i686-cygwin";
+  gnuplot = allBut cygwin;
   gnused = all;
   gnutar = all;
   gnutls = linux;
@@ -142,7 +142,7 @@ with import ./release-lib.nix { inherit supportedSystems; };
   policykit = linux;
   portmap = linux;
   procps = linux;
-  python = allBut "i686-cygwin";
+  python = allBut cygwin;
   pythonFull = linux;
   readline = all;
   rlwrap = all;
@@ -152,9 +152,9 @@ with import ./release-lib.nix { inherit supportedSystems; };
   scrot = linux;
   sdparm = linux;
   sharutils = all;
-  sloccount = allBut "i686-cygwin";
+  sloccount = allBut cygwin;
   smartmontools = all;
-  sqlite = allBut "i686-cygwin";
+  sqlite = allBut cygwin;
   squid = linux;
   ssmtp = linux;
   stdenv = prio 175 all;
diff --git a/pkgs/top-level/release.nix b/pkgs/top-level/release.nix
index 799b01c467c..da560b6997f 100644
--- a/pkgs/top-level/release.nix
+++ b/pkgs/top-level/release.nix
@@ -53,7 +53,7 @@ let
       audacious = linux;
       autoconf = all;
       automake = all;
-      avahi = allBut "i686-cygwin";  # Cygwin builds fail
+      avahi = allBut cygwin;  # Cygwin builds fail
       bash = all;
       bashInteractive = all;
       bazaar = linux; # first let sqlite3 work on darwin
@@ -133,7 +133,7 @@ let
       gnumake = all;
       gnupatch = all;
       gnupg = linux;
-      gnuplot = allBut "i686-cygwin";
+      gnuplot = allBut cygwin;
       gnused = all;
       gnutar = all;
       gnutls = linux;
@@ -211,7 +211,7 @@ let
       mysql = linux;
       mysql51 = linux;
       mysql55 = linux;
-      nano = allBut "i686-cygwin";
+      nano = allBut cygwin;
       ncat = linux;
       netcat = all;
       nfsUtils = linux;
@@ -244,7 +244,7 @@ let
       pthreadmanpages = linux;
       pygtk = linux;
       pyqt4 = linux;
-      python = allBut "i686-cygwin";
+      python = allBut cygwin;
       pythonFull = linux;
       sbcl = linux;
       qt3 = linux;
@@ -255,7 +255,7 @@ let
       rogue = all;
       rpm = linux;
       rsync = linux;
-      rubber = allBut "i686-cygwin";
+      rubber = allBut cygwin;
       ruby = all;
       rxvt_unicode = linux;
       screen = linux ++ darwin;
@@ -265,10 +265,10 @@ let
       sgtpuzzles = linux;
       sharutils = all;
       slim = linux;
-      sloccount = allBut "i686-cygwin";
+      sloccount = allBut cygwin;
       smartmontools = linux;
       spidermonkey = linux;
-      sqlite = allBut "i686-cygwin";
+      sqlite = allBut cygwin;
       squid = linux;
       ssmtp = linux;
       stdenv = prio 175 all;