diff --git a/pkgs/applications/editors/moe/default.nix b/pkgs/applications/editors/moe/default.nix
index 751b78ab674b..764877a11cb3 100644
--- a/pkgs/applications/editors/moe/default.nix
+++ b/pkgs/applications/editors/moe/default.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation rec {
     homepage = http://www.gnu.org/software/moe/;
     license = licenses.gpl2Plus;
     maintainers = with maintainers; [ AndersonTorres ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
 # TODO: a configurable, global moerc file
diff --git a/pkgs/applications/graphics/ocrad/default.nix b/pkgs/applications/graphics/ocrad/default.nix
index d88117916279..2ff62cc9eef2 100644
--- a/pkgs/applications/graphics/ocrad/default.nix
+++ b/pkgs/applications/graphics/ocrad/default.nix
@@ -29,6 +29,6 @@ stdenv.mkDerivation rec {
 
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ pSub ];
-    platforms = platforms.gnu ++ platforms.linux;  # arbitrary choice
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/applications/misc/gcal/default.nix b/pkgs/applications/misc/gcal/default.nix
index 67bb5feff8c7..f3f7fe2aacba 100644
--- a/pkgs/applications/misc/gcal/default.nix
+++ b/pkgs/applications/misc/gcal/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     '';
     homepage = https://www.gnu.org/software/gcal/;
     license = stdenv.lib.licenses.gpl3Plus;
-    platforms = stdenv.lib.platforms.linux;
+    platforms = stdenv.lib.platforms.unix;
     maintainers = [ stdenv.lib.maintainers.romildo ];
   };
 }
diff --git a/pkgs/applications/misc/gpa/default.nix b/pkgs/applications/misc/gpa/default.nix
index ef805a31567a..149092c70d38 100644
--- a/pkgs/applications/misc/gpa/default.nix
+++ b/pkgs/applications/misc/gpa/default.nix
@@ -15,6 +15,6 @@ stdenv.mkDerivation rec {
     description = "Graphical user interface for the GnuPG";
     homepage = https://www.gnupg.org/related_software/gpa/;
     license = licenses.gpl3Plus;
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/applications/science/math/pspp/default.nix b/pkgs/applications/science/math/pspp/default.nix
index 486a2e69d264..957a4cf64211 100644
--- a/pkgs/applications/science/math/pspp/default.nix
+++ b/pkgs/applications/science/math/pspp/default.nix
@@ -35,6 +35,6 @@ stdenv.mkDerivation rec {
       more traditional syntax commands.
     '';
 
-    platforms = stdenv.lib.platforms.linux;
+    platforms = stdenv.lib.platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/vcdimager/default.nix b/pkgs/development/libraries/vcdimager/default.nix
index 77956be3b12e..ddecf4a96a75 100644
--- a/pkgs/development/libraries/vcdimager/default.nix
+++ b/pkgs/development/libraries/vcdimager/default.nix
@@ -1,4 +1,5 @@
-{ stdenv, lib, fetchurl, pkgconfig, libcdio, libxml2, popt }:
+{ stdenv, lib, fetchurl, pkgconfig, libcdio, libxml2, popt
+, libiconv, darwin }:
 
 stdenv.mkDerivation rec {
   name = "vcdimager-2.0.1";
@@ -10,14 +11,15 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ pkgconfig ];
 
-  buildInputs = [ libxml2 popt ];
+  buildInputs = [ libxml2 popt libiconv ]
+             ++ lib.optionals stdenv.isDarwin (with darwin.apple_sdk.frameworks; [ IOKit DiskArbitration ]);
 
   propagatedBuildInputs = [ libcdio ];
 
   meta = with lib; {
     homepage = http://www.gnu.org/software/vcdimager/;
     description = "Full-featured mastering suite for authoring, disassembling and analyzing Video CDs and Super Video CDs";
-    platforms = platforms.gnu ++ platforms.linux; # random choice
+    platforms = platforms.unix;
     license = licenses.gpl2;
   };
 }
diff --git a/pkgs/development/tools/misc/dejagnu/default.nix b/pkgs/development/tools/misc/dejagnu/default.nix
index 0cb483027c19..b734eadae902 100644
--- a/pkgs/development/tools/misc/dejagnu/default.nix
+++ b/pkgs/development/tools/misc/dejagnu/default.nix
@@ -49,7 +49,7 @@ stdenv.mkDerivation rec {
     homepage = http://www.gnu.org/software/dejagnu/;
     license = licenses.gpl2Plus;
 
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     maintainers = with maintainers; [ wkennington vrthra ];
   };
 }
diff --git a/pkgs/games/ball-and-paddle/default.nix b/pkgs/games/ball-and-paddle/default.nix
index 4a7eb9376da7..dbd2814a6fb6 100644
--- a/pkgs/games/ball-and-paddle/default.nix
+++ b/pkgs/games/ball-and-paddle/default.nix
@@ -37,7 +37,6 @@ stdenv.mkDerivation rec {
 
     maintainers = [ ];
 
-    # The fancy libs aren't available on {Cyg,Dar}win.
-    platforms = stdenv.lib.platforms.linux;
+    platforms = stdenv.lib.platforms.unix;
   };
 }
diff --git a/pkgs/tools/networking/inetutils/default.nix b/pkgs/tools/networking/inetutils/default.nix
index 04045615a9b4..c050758a8ee3 100644
--- a/pkgs/tools/networking/inetutils/default.nix
+++ b/pkgs/tools/networking/inetutils/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchurl, ncurses, perl, help2man }:
+{ stdenv, lib, fetchurl, ncurses, perl, help2man }:
 
 stdenv.mkDerivation rec {
   name = "inetutils-1.9.4";
@@ -16,25 +16,20 @@ stdenv.mkDerivation rec {
   buildInputs = [ ncurses /* for `talk' */ perl /* for `whois' */ help2man ];
 
   configureFlags = [ "--with-ncurses-include-dir=${ncurses.dev}/include" ]
-  ++ stdenv.lib.optionals stdenv.hostPlatform.isMusl [ # Musl doesn't define rcmd
+  ++ lib.optionals stdenv.hostPlatform.isMusl [ # Musl doesn't define rcmd
     "--disable-rcp"
     "--disable-rsh"
     "--disable-rlogin"
     "--disable-rexec"
-  ];
+  ] ++ lib.optional stdenv.isDarwin  "--disable-servers";
 
   # Test fails with "UNIX socket name too long", probably because our
   # $TMPDIR is too long.
-  #doCheck = true;
+  doCheck = false;
 
+  installFlags = [ "SUIDMODE=" ];
 
-  postInstall = ''
-    # XXX: These programs are normally installed setuid but since it
-    # fails, they end up being non-executable, hence this hack.
-    chmod +x $out/bin/{ping,ping6,${stdenv.lib.optionalString (!stdenv.hostPlatform.isMusl) ''rcp,rlogin,rsh,''}traceroute}
-  '';
-
-  meta = {
+  meta = with lib; {
     description = "Collection of common network programs";
 
     longDescription =
@@ -45,9 +40,9 @@ stdenv.mkDerivation rec {
       '';
 
     homepage = http://www.gnu.org/software/inetutils/;
-    license = stdenv.lib.licenses.gpl3Plus;
+    license = licenses.gpl3Plus;
 
-    maintainers = [ ];
-    platforms = stdenv.lib.platforms.gnu ++ stdenv.lib.platforms.linux;
+    maintainers = with maintainers; [ matthewbauer ];
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/tools/networking/jwhois/default.nix b/pkgs/tools/networking/jwhois/default.nix
index cd0821ef9ef5..be8e9e210d15 100644
--- a/pkgs/tools/networking/jwhois/default.nix
+++ b/pkgs/tools/networking/jwhois/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
   meta = {
     description = "A client for the WHOIS protocol allowing you to query the owner of a domain name";
     homepage = http://www.gnu.org/software/jwhois/;
-    license = "GPL";
-    platforms = stdenv.lib.platforms.linux;
+    license = stdenv.lib.licenses.gpl3;
+    platforms = stdenv.lib.platforms.unix;
   };
 }
diff --git a/pkgs/tools/security/dirmngr/default.nix b/pkgs/tools/security/dirmngr/default.nix
index bd94c6786d77..888fa48eab9a 100644
--- a/pkgs/tools/security/dirmngr/default.nix
+++ b/pkgs/tools/security/dirmngr/default.nix
@@ -1,4 +1,5 @@
-{ stdenv, fetchurl, libgpgerror, libgcrypt, libassuan, libksba, pth, openldap }:
+{ stdenv, fetchurl, libgpgerror, libgcrypt, libassuan, libksba, pth, openldap
+, libiconv}:
 
 stdenv.mkDerivation rec {
   name = "dirmngr-1.1.1";
@@ -6,9 +7,10 @@ stdenv.mkDerivation rec {
     url = "mirror://gnupg/dirmngr/${name}.tar.bz2";
     sha256 = "1zz6m87ca55nq5f59hzm6qs48d37h93il881y7d0rf2d6660na6j";
   };
-  buildInputs = [ libgpgerror libgcrypt libassuan libksba pth openldap ];
+  buildInputs = [ libgpgerror libgcrypt libassuan libksba
+                  pth openldap libiconv ];
 
   meta = {
-    platforms = stdenv.lib.platforms.linux;
+    platforms = stdenv.lib.platforms.unix;
   };
 }