diff --git a/pkgs/applications/editors/focuswriter/default.nix b/pkgs/applications/editors/focuswriter/default.nix
index bb897b2e7e2b..0e4a6a5bf207 100644
--- a/pkgs/applications/editors/focuswriter/default.nix
+++ b/pkgs/applications/editors/focuswriter/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     description = "Simple, distraction-free writing environment";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ madjar ];
-    platforms = platforms.all;
+    platforms = platforms.linux;
     homepage = https://gottcode.org/focuswriter/;
   };
 }
diff --git a/pkgs/applications/misc/gkrellm/default.nix b/pkgs/applications/misc/gkrellm/default.nix
index b9cbf8064a07..b4fac899f66f 100644
--- a/pkgs/applications/misc/gkrellm/default.nix
+++ b/pkgs/applications/misc/gkrellm/default.nix
@@ -41,6 +41,6 @@ stdenv.mkDerivation rec {
     homepage = http://gkrellm.srcbox.net;
     license = licenses.gpl3Plus;
     maintainers = [ ];
-    platforms = platforms.unix;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/applications/misc/jgmenu/default.nix b/pkgs/applications/misc/jgmenu/default.nix
index e87288d71287..ffb898b265c2 100644
--- a/pkgs/applications/misc/jgmenu/default.nix
+++ b/pkgs/applications/misc/jgmenu/default.nix
@@ -34,7 +34,7 @@ stdenv.mkDerivation rec {
     homepage = https://github.com/johanmalm/jgmenu;
     description = "Small X11 menu intended to be used with openbox and tint2";
     license = licenses.gpl2;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = [ maintainers.romildo ];
   };
 }
diff --git a/pkgs/applications/misc/posterazor/default.nix b/pkgs/applications/misc/posterazor/default.nix
index 1347840ee674..6cb00fb1525c 100644
--- a/pkgs/applications/misc/posterazor/default.nix
+++ b/pkgs/applications/misc/posterazor/default.nix
@@ -32,6 +32,6 @@ stdenv.mkDerivation rec {
     homepage = http://posterazor.sourceforge.net/;
     description = "Cuts a raster image into pieces which can afterwards be printed out and assembled to a poster";
     maintainers = [ stdenv.lib.maintainers.madjar ];
-    platforms = stdenv.lib.platforms.all;
+    platforms = stdenv.lib.platforms.linux;
   };
 }
diff --git a/pkgs/applications/networking/offrss/default.nix b/pkgs/applications/networking/offrss/default.nix
index af6a4dfddc1b..d499916c7b6c 100644
--- a/pkgs/applications/networking/offrss/default.nix
+++ b/pkgs/applications/networking/offrss/default.nix
@@ -28,6 +28,6 @@ stdenv.mkDerivation {
     description = "Offline RSS/Atom reader";
     license="AGPLv3+";
     maintainers = with stdenv.lib.maintainers; [viric];
-    platforms = with stdenv.lib.platforms; all;
+    platforms = stdenv.lib.platforms.linux;
   };
 }
diff --git a/pkgs/applications/search/catfish/default.nix b/pkgs/applications/search/catfish/default.nix
index 79af80ea75f5..adf0f51fc4cc 100644
--- a/pkgs/applications/search/catfish/default.nix
+++ b/pkgs/applications/search/catfish/default.nix
@@ -61,7 +61,7 @@ pythonPackages.buildPythonApplication rec {
       options.
     '';
     license = licenses.gpl2Plus;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = [ maintainers.romildo ];
   };
 }
diff --git a/pkgs/applications/window-managers/icewm/default.nix b/pkgs/applications/window-managers/icewm/default.nix
index ffd1d995e87b..3329b3b69e07 100644
--- a/pkgs/applications/window-managers/icewm/default.nix
+++ b/pkgs/applications/window-managers/icewm/default.nix
@@ -34,6 +34,6 @@ stdenv.mkDerivation rec {
     homepage = http://www.icewm.org/;
     license = licenses.lgpl2;
     maintainers = [ maintainers.AndersonTorres ];
-    platforms = platforms.unix;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/data/fonts/emojione/default.nix b/pkgs/data/fonts/emojione/default.nix
index 560aed970bbf..9d4c1e22e145 100644
--- a/pkgs/data/fonts/emojione/default.nix
+++ b/pkgs/data/fonts/emojione/default.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
     description = "Open source emoji set";
     homepage = http://emojione.com/;
     license = licenses.cc-by-40;
-    platforms = platforms.all;
+    platforms = platforms.linux;
     maintainers = with maintainers; [ abbradar ];
   };
 }
diff --git a/pkgs/desktops/mate/mate-calc/default.nix b/pkgs/desktops/mate/mate-calc/default.nix
index 5f968633d938..7e501fcf379b 100644
--- a/pkgs/desktops/mate/mate-calc/default.nix
+++ b/pkgs/desktops/mate/mate-calc/default.nix
@@ -25,7 +25,7 @@ stdenv.mkDerivation rec {
     description = "Calculator for the MATE desktop";
     homepage = http://mate-desktop.org;
     license = [ licenses.gpl2Plus ];
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = [ maintainers.romildo ];
   };
 }
diff --git a/pkgs/desktops/mate/mate-icon-theme/default.nix b/pkgs/desktops/mate/mate-icon-theme/default.nix
index 93ad93b07b98..7291b475fe16 100644
--- a/pkgs/desktops/mate/mate-icon-theme/default.nix
+++ b/pkgs/desktops/mate/mate-icon-theme/default.nix
@@ -12,18 +12,18 @@ stdenv.mkDerivation rec {
   nativeBuildInputs = [ pkgconfig intltool iconnamingutils ];
 
   buildInputs = [ librsvg hicolor-icon-theme ];
-  
+
   postInstall = ''
     for theme in "$out"/share/icons/*; do
       "${gtk3.out}/bin/gtk-update-icon-cache" "$theme"
     done
   '';
-  
+
   meta = {
     description = "Icon themes from MATE";
     homepage = http://mate-desktop.org;
     license = stdenv.lib.licenses.lgpl3;
-    platforms = stdenv.lib.platforms.unix;
+    platforms = stdenv.lib.platforms.linux;
     maintainers = [ stdenv.lib.maintainers.romildo ];
   };
 }
diff --git a/pkgs/development/guile-modules/guile-fibers/default.nix b/pkgs/development/guile-modules/guile-fibers/default.nix
index 5f82a93c513a..cfb56790221e 100644
--- a/pkgs/development/guile-modules/guile-fibers/default.nix
+++ b/pkgs/development/guile-modules/guile-fibers/default.nix
@@ -23,6 +23,6 @@ in stdenv.mkDerivation {
     homepage = https://github.com/wingo/fibers;
     license = licenses.lgpl3Plus;
     maintainers = with maintainers; [ vyp ];
-    platforms = platforms.all;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/development/libraries/dlib/default.nix b/pkgs/development/libraries/dlib/default.nix
index 53ec9949f170..eaae1f7ecdad 100644
--- a/pkgs/development/libraries/dlib/default.nix
+++ b/pkgs/development/libraries/dlib/default.nix
@@ -26,7 +26,7 @@ stdenv.mkDerivation rec {
     homepage = http://www.dlib.net;
     license = licenses.boost;
     maintainers = with maintainers; [ christopherpoole ];
-    platforms = platforms.all;
+    platforms = platforms.linux;
   };
 }
 
diff --git a/pkgs/development/libraries/globalplatform/default.nix b/pkgs/development/libraries/globalplatform/default.nix
index 5b55a09db625..3ef279616f75 100644
--- a/pkgs/development/libraries/globalplatform/default.nix
+++ b/pkgs/development/libraries/globalplatform/default.nix
@@ -16,6 +16,6 @@ stdenv.mkDerivation rec {
     homepage = https://sourceforge.net/p/globalplatform/wiki/Home/;
     description = "Library for interacting with smart card devices";
     license = licenses.gpl3;
-    platforms = platforms.all;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/development/libraries/gstreamer/gstreamermm/default.nix b/pkgs/development/libraries/gstreamer/gstreamermm/default.nix
index bee80cb24ecf..14e27ab6068c 100644
--- a/pkgs/development/libraries/gstreamer/gstreamermm/default.nix
+++ b/pkgs/development/libraries/gstreamer/gstreamermm/default.nix
@@ -24,7 +24,7 @@ stdenv.mkDerivation rec {
     description = "C++ interface for GStreamer";
     homepage = https://gstreamer.freedesktop.org/bindings/cplusplus.html;
     license = licenses.lgpl21Plus;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = with maintainers; [ romildo ];
   };
 
diff --git a/pkgs/development/libraries/herqq/default.nix b/pkgs/development/libraries/herqq/default.nix
index 8f1aadc3a26e..75dd8693d2cf 100644
--- a/pkgs/development/libraries/herqq/default.nix
+++ b/pkgs/development/libraries/herqq/default.nix
@@ -15,10 +15,10 @@ stdenv.mkDerivation rec {
     sha256 = "1w674rbwbhpirq70gp9rk6p068j36rwn112fx3nz613wgw63x84m";
   };
 
-  meta = {
+  meta = with stdenv.lib; {
     homepage = http://herqq.org;
     description = "A software library for building UPnP devices and control points";
-    inherit (qt5.qtbase.meta) platforms;
+    platforms = platforms.linux;
     maintainers = [ ];
   };
 }
diff --git a/pkgs/development/libraries/openvdb/default.nix b/pkgs/development/libraries/openvdb/default.nix
index f9540d2c4d20..8ed383c887bf 100644
--- a/pkgs/development/libraries/openvdb/default.nix
+++ b/pkgs/development/libraries/openvdb/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation rec
     LOG4CPLUS_LIB=
     BLOSC_INCLUDE_DIR=${c-blosc}/include/
     BLOSC_LIB_DIR=${c-blosc}/lib/
-    '';
+  '';
 
   installFlags = ''DESTDIR=$(out)'';
 
@@ -43,7 +43,7 @@ stdenv.mkDerivation rec
     description = "An open framework for voxel";
     homepage = "http://www.openvdb.org";
     maintainers = [ maintainers.guibou ];
-    platforms = platforms.all;
+    platforms = platforms.linux;
     license = licenses.mpl20;
   };
 }
diff --git a/pkgs/development/libraries/schroedinger/default.nix b/pkgs/development/libraries/schroedinger/default.nix
index d8e67baa13df..2309719c2bdc 100644
--- a/pkgs/development/libraries/schroedinger/default.nix
+++ b/pkgs/development/libraries/schroedinger/default.nix
@@ -22,6 +22,6 @@ stdenv.mkDerivation {
     homepage = http://diracvideo.org/;
     maintainers = [ maintainers.spwhitt ];
     license = [ licenses.mpl11 licenses.lgpl2 licenses.mit ];
-    platforms = platforms.unix;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/development/libraries/science/math/caffe2/default.nix b/pkgs/development/libraries/science/math/caffe2/default.nix
index af7078599db5..916bf122b3c2 100644
--- a/pkgs/development/libraries/science/math/caffe2/default.nix
+++ b/pkgs/development/libraries/science/math/caffe2/default.nix
@@ -137,7 +137,7 @@ stdenv.mkDerivation rec {
       algorithms. You can bring your creations to scale using the power of GPUs in the
       cloud or to the masses on mobile with Caffe2's cross-platform libraries.
     '';
-    platforms = with stdenv.lib.platforms; linux ++ darwin;
+    platforms = with stdenv.lib.platforms; linux;
     license = stdenv.lib.licenses.asl20;
     maintainers = with stdenv.lib.maintainers; [ yuriaisaka ];
   };
diff --git a/pkgs/servers/ftp/pure-ftpd/default.nix b/pkgs/servers/ftp/pure-ftpd/default.nix
index 3728ee6c2a8f..f41bb726a28c 100644
--- a/pkgs/servers/ftp/pure-ftpd/default.nix
+++ b/pkgs/servers/ftp/pure-ftpd/default.nix
@@ -17,6 +17,6 @@ stdenv.mkDerivation rec {
     homepage = https://www.pureftpd.org;
     license = licenses.isc; # with some parts covered by BSD3(?)
     maintainers = [ maintainers.lethalman ];
-    platforms = platforms.unix;
+    platforms = platforms.linux;
   };
 }
diff --git a/pkgs/servers/mail/opensmtpd/extras.nix b/pkgs/servers/mail/opensmtpd/extras.nix
index 5e87a1fb0995..6b63c317d78f 100644
--- a/pkgs/servers/mail/opensmtpd/extras.nix
+++ b/pkgs/servers/mail/opensmtpd/extras.nix
@@ -75,7 +75,7 @@ stdenv.mkDerivation rec {
     homepage = https://www.opensmtpd.org/;
     description = "Extra plugins for the OpenSMTPD mail server";
     license = licenses.isc;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = with maintainers; [ gebner ];
   };
 }
diff --git a/pkgs/tools/backup/mtx/default.nix b/pkgs/tools/backup/mtx/default.nix
index bc1f584f1c02..46f213a6ef4c 100644
--- a/pkgs/tools/backup/mtx/default.nix
+++ b/pkgs/tools/backup/mtx/default.nix
@@ -22,6 +22,6 @@ stdenv.mkDerivation rec {
     homepage = https://sourceforge.net/projects/mtx/;
     license = stdenv.lib.licenses.gpl2;
     maintainers = [ stdenv.lib.maintainers.redvers ];
-    platforms = stdenv.lib.platforms.all;
+    platforms = stdenv.lib.platforms.linux;
   };
 }
diff --git a/pkgs/tools/networking/axel/default.nix b/pkgs/tools/networking/axel/default.nix
index c9d689b8b2c1..2155d3c1b3d8 100644
--- a/pkgs/tools/networking/axel/default.nix
+++ b/pkgs/tools/networking/axel/default.nix
@@ -19,6 +19,6 @@ stdenv.mkDerivation rec {
     description = "Console downloading program with some features for parallel connections for faster downloading";
     homepage = http://axel.alioth.debian.org/;
     maintainers = with maintainers; [ pSub ];
-    platforms = with platforms; linux ++ darwin;
+    platforms = with platforms; linux;
   };
 }
diff --git a/pkgs/tools/networking/htpdate/default.nix b/pkgs/tools/networking/htpdate/default.nix
index f0bb4ab46fae..c8e14ad7f697 100644
--- a/pkgs/tools/networking/htpdate/default.nix
+++ b/pkgs/tools/networking/htpdate/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "Utility to fetch time and set the system clock over HTTP";
     homepage = http://www.vervest.org/htp/;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     license = licenses.gpl2Plus;
   };
 }
diff --git a/pkgs/tools/system/ipmitool/default.nix b/pkgs/tools/system/ipmitool/default.nix
index fe411edfcdac..c906ad3c8cf1 100644
--- a/pkgs/tools/system/ipmitool/default.nix
+++ b/pkgs/tools/system/ipmitool/default.nix
@@ -32,7 +32,7 @@ stdenv.mkDerivation {
     description = ''Command-line interface to IPMI-enabled devices'';
     license = licenses.bsd3;
     homepage = https://sourceforge.net/projects/ipmitool/;
-    platforms = platforms.unix;
+    platforms = platforms.linux;
     maintainers = with maintainers; [ fpletz ];
   };
 }
diff --git a/pkgs/tools/system/s6-rc/default.nix b/pkgs/tools/system/s6-rc/default.nix
index 13ce2414abf0..ed1da8d450dc 100644
--- a/pkgs/tools/system/s6-rc/default.nix
+++ b/pkgs/tools/system/s6-rc/default.nix
@@ -37,7 +37,7 @@ in stdenv.mkDerivation rec {
   meta = {
     homepage = http://skarnet.org/software/s6-rc/;
     description = "A service manager for s6-based systems";
-    platforms = stdenv.lib.platforms.all;
+    platforms = stdenv.lib.platforms.linux;
     license = stdenv.lib.licenses.isc;
     maintainers = with stdenv.lib.maintainers; [ pmahoney ];
   };
diff --git a/pkgs/tools/system/sg3_utils/default.nix b/pkgs/tools/system/sg3_utils/default.nix
index c1c4527d0a0a..ca1af7a74e4b 100644
--- a/pkgs/tools/system/sg3_utils/default.nix
+++ b/pkgs/tools/system/sg3_utils/default.nix
@@ -11,7 +11,7 @@ stdenv.mkDerivation rec {
   meta = {
     homepage = http://sg.danny.cz/sg/;
     description = "Utilities that send SCSI commands to devices";
-    platforms = stdenv.lib.platforms.all;
+    platforms = stdenv.lib.platforms.linux;
     maintainers = [ ];
   };
 }