diff --git a/pkgs/os-specific/linux/alsa-lib/default.nix b/pkgs/os-specific/linux/alsa-lib/default.nix
index 239c70d515d5..8ad77c6b99e0 100644
--- a/pkgs/os-specific/linux/alsa-lib/default.nix
+++ b/pkgs/os-specific/linux/alsa-lib/default.nix
@@ -11,35 +11,6 @@ stdenv.mkDerivation rec {
     sha256 = "068d8c92122hwca5jzhrjp4a131995adlb1d79zgrm7gwy9x63k9";
   };
 
-  configureFlags = "--disable-xmlto";
-
-  # Fix pcm.h file in order to prevent some compilation bugs
-  # 2: see http://stackoverflow.com/questions/3103400/how-to-overcome-u-int8-t-vs-uint8-t-issue-efficiently
-  postPatch = ''
-    sed -i -e 's|//int snd_pcm_mixer_element(snd_pcm_t \*pcm, snd_mixer_t \*mixer, snd_mixer_elem_t \*\*elem);|/\*int snd_pcm_mixer_element(snd_pcm_t \*pcm, snd_mixer_t \*mixer, snd_mixer_elem_t \*\*elem);\*/|' include/pcm.h
-
-
-    sed -i -e '1i#include <stdint.h>' include/pcm.h
-    sed -i -e 's/u_int\([0-9]*\)_t/uint\1_t/g' include/pcm.h
-  '';
-
-  crossAttrs = {
-    patchPhase = ''
-      sed -i s/extern/static/g include/iatomic.h
-    '';
-  };
-
-  meta = {
-    description = "ALSA, the Advanced Linux Sound Architecture libraries";
-
-    longDescription = ''
-      The Advanced Linux Sound Architecture (ALSA) provides audio and
-      MIDI functionality to the Linux-based operating system.
-    '';
-
-    homepage = http://www.alsa-project.org/;
-  };
-
   patches = [
     /* allow specifying alternatives alsa plugin locations using
        export ALSA_PLUGIN_DIRS=$(nix-build -A alsaPlugins)/lib/alsa-lib
@@ -53,4 +24,34 @@ stdenv.mkDerivation rec {
        on mips, because lacks some symbols atomic_add/atomic_sub  */
     ./mips-atomic.patch
   ];
+
+  # Fix pcm.h file in order to prevent some compilation bugs
+  # 2: see http://stackoverflow.com/questions/3103400/how-to-overcome-u-int8-t-vs-uint8-t-issue-efficiently
+  postPatch = ''
+    sed -i -e 's|//int snd_pcm_mixer_element(snd_pcm_t \*pcm, snd_mixer_t \*mixer, snd_mixer_elem_t \*\*elem);|/\*int snd_pcm_mixer_element(snd_pcm_t \*pcm, snd_mixer_t \*mixer, snd_mixer_elem_t \*\*elem);\*/|' include/pcm.h
+
+
+    sed -i -e '1i#include <stdint.h>' include/pcm.h
+    sed -i -e 's/u_int\([0-9]*\)_t/uint\1_t/g' include/pcm.h
+  '';
+
+  configureFlags = "--disable-xmlto";
+
+  crossAttrs = {
+    patchPhase = ''
+      sed -i s/extern/static/g include/iatomic.h
+    '';
+  };
+
+  meta = {
+    homepage = http://www.alsa-project.org/;
+    description = "ALSA, the Advanced Linux Sound Architecture libraries";
+
+    longDescription = ''
+      The Advanced Linux Sound Architecture (ALSA) provides audio and
+      MIDI functionality to the Linux-based operating system.
+    '';
+
+    platforms = stdenv.lib.platforms.linux;
+  };
 }
diff --git a/pkgs/os-specific/linux/alsa-oss/default.nix b/pkgs/os-specific/linux/alsa-oss/default.nix
index 98bf4374b4fc..904c56665d15 100644
--- a/pkgs/os-specific/linux/alsa-oss/default.nix
+++ b/pkgs/os-specific/linux/alsa-oss/default.nix
@@ -21,6 +21,7 @@ stdenv.mkDerivation rec {
     '';
 
   meta = {
+    homepage = http://www.alsa-project.org/;
     description = "ALSA, the Advanced Linux Sound Architecture alsa-oss emulation";
 
     longDescription = ''
@@ -28,6 +29,6 @@ stdenv.mkDerivation rec {
       MIDI functionality to the Linux-based operating system.
     '';
 
-    homepage = http://www.alsa-project.org/;
+    platforms = stdenv.lib.platforms.linux;
   };
 }
diff --git a/pkgs/os-specific/linux/alsa-utils/default.nix b/pkgs/os-specific/linux/alsa-utils/default.nix
index 3eafe8bbfe5b..484ecd06bb0b 100644
--- a/pkgs/os-specific/linux/alsa-utils/default.nix
+++ b/pkgs/os-specific/linux/alsa-utils/default.nix
@@ -23,6 +23,7 @@ stdenv.mkDerivation rec {
     '';
 
   meta = {
+    homepage = http://www.alsa-project.org/;
     description = "ALSA, the Advanced Linux Sound Architecture utils";
 
     longDescription = ''
@@ -30,6 +31,6 @@ stdenv.mkDerivation rec {
       MIDI functionality to the Linux-based operating system.
     '';
 
-    homepage = http://www.alsa-project.org/;
+    platforms = stdenv.lib.platforms.linux;
   };
 }