diff --git a/pkgs/development/python-modules/pyqt/default.nix b/pkgs/development/python-modules/pyqt/default.nix
index ac7e3efcee43..45ed2d1f031f 100644
--- a/pkgs/development/python-modules/pyqt/default.nix
+++ b/pkgs/development/python-modules/pyqt/default.nix
@@ -13,5 +13,6 @@ stdenv.mkDerivation {
     license = "GPL";
     homepage = http://www.riverbankcomputing.co.uk;
     maintainers = [ lib.maintainers.sander ];
+    platforms = lib.platforms.mesaPlatforms;
   };
 }
diff --git a/pkgs/lib/platforms.nix b/pkgs/lib/platforms.nix
index ecb13e2773dd..c63544ce59d8 100644
--- a/pkgs/lib/platforms.nix
+++ b/pkgs/lib/platforms.nix
@@ -9,4 +9,5 @@ rec {
   cygwin = ["i686-cygwin"];
   all = linux ++ darwin ++ cygwin ++ freebsd;
   allBut = platform: lists.filter (x: platform != x) all;
+  mesaPlatforms = linux ++ darwin ++ freebsd;
 }
diff --git a/pkgs/tools/misc/partition-manager/default.nix b/pkgs/tools/misc/partition-manager/default.nix
index ef779b554757..456e12fe4982 100644
--- a/pkgs/tools/misc/partition-manager/default.nix
+++ b/pkgs/tools/misc/partition-manager/default.nix
@@ -29,5 +29,6 @@ stdenv.mkDerivation {
     homepage = http://www.kde-apps.org/content/show.php/KDE+Partition+Manager?content=89595; # ?
     license = "GPL";
     maintainers = [args.lib.maintainers.marcweber];
+    platforms = args.lib.platforms.linux;
   };
 }
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 549aed5fa92d..a67b4cc2f180 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -3866,7 +3866,8 @@ let
 
   mesaSupported =
     system == "i686-linux" ||
-    system == "x86_64-linux";
+    system == "x86_64-linux" ||
+    system == "i686-darwin";
 
   mesa = import ../development/libraries/mesa {
     inherit fetchurl stdenv pkgconfig expat x11 xlibs libdrm;