diff --git a/pkgs/development/guile-modules/guile-opengl/default.nix b/pkgs/development/guile-modules/guile-opengl/default.nix
index effa651b99c8..5ada5d41c7d9 100644
--- a/pkgs/development/guile-modules/guile-opengl/default.nix
+++ b/pkgs/development/guile-modules/guile-opengl/default.nix
@@ -18,6 +18,6 @@ in stdenv.mkDerivation {
     homepage = "https://www.gnu.org/software/guile-opengl/";
     license = licenses.gpl3Plus;
     maintainers = with maintainers; [ vyp ];
-    platforms = platforms.linux;
+    platforms = platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/clucene-core/default.nix b/pkgs/development/libraries/clucene-core/default.nix
index 20b0a3b547ca..8d5b389150a4 100644
--- a/pkgs/development/libraries/clucene-core/default.nix
+++ b/pkgs/development/libraries/clucene-core/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
       CLucene is a port of the very popular Java Lucene text search engine API.
     '';
     homepage = "http://clucene.sourceforge.net";
-    platforms = platforms.linux;
+    platforms = platforms.unix;
     license = with licenses; [ asl20 lgpl2 ];
   };
 }
diff --git a/pkgs/development/libraries/gtkdatabox/default.nix b/pkgs/development/libraries/gtkdatabox/default.nix
index d7cca43841e4..ddab0046b660 100644
--- a/pkgs/development/libraries/gtkdatabox/default.nix
+++ b/pkgs/development/libraries/gtkdatabox/default.nix
@@ -17,6 +17,6 @@ stdenv.mkDerivation rec {
 
     license = lib.licenses.lgpl2;
 
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/htmlcxx/default.nix b/pkgs/development/libraries/htmlcxx/default.nix
index 286834112f27..d9072e46e407 100644
--- a/pkgs/development/libraries/htmlcxx/default.nix
+++ b/pkgs/development/libraries/htmlcxx/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl }:
+{ lib, stdenv, fetchurl, libiconv }:
 
 stdenv.mkDerivation rec {
   pname = "htmlcxx";
@@ -9,12 +9,13 @@ stdenv.mkDerivation rec {
     sha256 = "1hgmyiad3qgbpf2dvv2jygzj6jpz4dl3n8ds4nql68a4l9g2nm07";
   };
 
+  buildInputs = [ libiconv ];
   patches = [ ./ptrdiff.patch ];
 
   meta = with lib; {
     homepage = "http://htmlcxx.sourceforge.net/";
     description = "A simple non-validating css1 and html parser for C++";
     license = licenses.lgpl2;
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/kissfft/default.nix b/pkgs/development/libraries/kissfft/default.nix
index 5395ac4ab9c1..fe52adfa20d7 100644
--- a/pkgs/development/libraries/kissfft/default.nix
+++ b/pkgs/development/libraries/kissfft/default.nix
@@ -30,6 +30,11 @@ stdenv.mkDerivation rec {
     })
   ];
 
+  postPatch = ''
+    substituteInPlace Makefile \
+      --replace "gcc" "${stdenv.cc.targetPrefix}cc" \
+      --replace "ar" "${stdenv.cc.targetPrefix}ar"
+  '';
   makeFlags = [
     "PREFIX=${placeholder "out"}"
     "DATATYPE=double"
@@ -40,6 +45,6 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/mborgerding/kissfft";
     license = licenses.bsd3;
     maintainers = [ maintainers.goibhniu ];
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/levmar/default.nix b/pkgs/development/libraries/levmar/default.nix
index c5d6877a8446..ed945d9e5a08 100644
--- a/pkgs/development/libraries/levmar/default.nix
+++ b/pkgs/development/libraries/levmar/default.nix
@@ -9,8 +9,9 @@ stdenv.mkDerivation rec {
   };
 
   patchPhase = ''
-    sed -i 's/define HAVE_LAPACK/undef HAVE_LAPACK/' levmar.h
+    substituteInPlace levmar.h --replace "define HAVE_LAPACK" "undef HAVE_LAPACK"
     sed -i 's/LAPACKLIBS=.*/LAPACKLIBS=/' Makefile
+    substituteInPlace Makefile --replace "gcc" "${stdenv.cc.targetPrefix}cc"
   '';
 
   installPhase = ''
@@ -23,6 +24,6 @@ stdenv.mkDerivation rec {
     description = "ANSI C implementations of Levenberg-Marquardt, usable also from C++";
     homepage = "https://www.ics.forth.gr/~lourakis/levmar/";
     license = lib.licenses.gpl2Plus;
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/libcec/platform.nix b/pkgs/development/libraries/libcec/platform.nix
index 15972272a187..61eccf1f40ea 100644
--- a/pkgs/development/libraries/libcec/platform.nix
+++ b/pkgs/development/libraries/libcec/platform.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation {
     homepage = "https://github.com/Pulse-Eight/platform";
     repositories.git = "https://github.com/Pulse-Eight/platform.git";
     license = lib.licenses.gpl2Plus;
-    platforms = platforms.linux;
+    platforms = platforms.all;
     maintainers = [ maintainers.titanous ];
   };
 }
diff --git a/pkgs/development/libraries/libcli/default.nix b/pkgs/development/libraries/libcli/default.nix
index ceb0338e5cc1..8aa06bfb19bc 100644
--- a/pkgs/development/libraries/libcli/default.nix
+++ b/pkgs/development/libraries/libcli/default.nix
@@ -20,12 +20,12 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  makeFlags = [ "PREFIX=$(out)" ];
+  makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" "AR=${stdenv.cc.targetPrefix}ar" "PREFIX=$(out)" ];
 
   meta = with lib; {
     description = "Emulate a Cisco-style telnet command-line interface";
     homepage = "http://sites.dparrish.com/libcli";
     license = licenses.lgpl21Plus;
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/libcredis/default.nix b/pkgs/development/libraries/libcredis/default.nix
index 902f5a6ee26f..247d341bce97 100644
--- a/pkgs/development/libraries/libcredis/default.nix
+++ b/pkgs/development/libraries/libcredis/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation {
     description = "C client library for Redis (key-value database)";
     homepage = "https://code.google.com/archive/p/credis/";
     license = licenses.bsd3; # from homepage
-    platforms = platforms.linux;
+    platforms = platforms.all;
     maintainers = [ maintainers.bjornfor ];
   };
 }
diff --git a/pkgs/development/libraries/libcsptr/default.nix b/pkgs/development/libraries/libcsptr/default.nix
index e30165054aa0..a8f33deda36c 100644
--- a/pkgs/development/libraries/libcsptr/default.nix
+++ b/pkgs/development/libraries/libcsptr/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     description = "Smart pointer constructs for the (GNU) C programming language";
     homepage = "https://github.com/Snaipe/libcsptr";
     license = licenses.mit;
-    platforms = [ "i686-linux" "x86_64-linux" ];
+    platforms = platforms.all;
     maintainers = [ maintainers.fragamus ];
   };
 }
diff --git a/pkgs/development/libraries/liblcf/default.nix b/pkgs/development/libraries/liblcf/default.nix
index 2c7f09892820..1e6f57368b78 100644
--- a/pkgs/development/libraries/liblcf/default.nix
+++ b/pkgs/development/libraries/liblcf/default.nix
@@ -19,6 +19,6 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/EasyRPG/liblcf";
     license = licenses.mit;
     maintainers = with maintainers; [ yegortimoshenko ];
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/libnatpmp/default.nix b/pkgs/development/libraries/libnatpmp/default.nix
index dd902c0021dd..11b8d66b4a8f 100644
--- a/pkgs/development/libraries/libnatpmp/default.nix
+++ b/pkgs/development/libraries/libnatpmp/default.nix
@@ -10,6 +10,12 @@ stdenv.mkDerivation rec {
     sha256 = "1c1n8n7mp0amsd6vkz32n8zj3vnsckv308bb7na0dg0r8969rap1";
   };
 
+  postPatch = ''
+    substituteInPlace Makefile \
+      --replace "gcc" "${stdenv.cc.targetPrefix}cc" \
+      --replace "ar" "${stdenv.cc.targetPrefix}ar"
+  '';
+
   makeFlags = [ "INSTALLPREFIX=$(out)" ];
 
   meta = with lib; {
@@ -17,6 +23,6 @@ stdenv.mkDerivation rec {
     description = "NAT-PMP client";
     license = licenses.bsd3;
     maintainers = with maintainers; [ orivej ];
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/libnest2d/default.nix b/pkgs/development/libraries/libnest2d/default.nix
index 567598500d61..1e666758f816 100644
--- a/pkgs/development/libraries/libnest2d/default.nix
+++ b/pkgs/development/libraries/libnest2d/default.nix
@@ -25,6 +25,6 @@ stdenv.mkDerivation rec {
       "2D irregular bin packaging and nesting library written in modern C++";
     homepage = "https://github.com/Ultimaker/libnest2d";
     license = licenses.lgpl3;
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/liboauth/default.nix b/pkgs/development/libraries/liboauth/default.nix
index caab0a83fcf6..5fe5ba86bea3 100644
--- a/pkgs/development/libraries/liboauth/default.nix
+++ b/pkgs/development/libraries/liboauth/default.nix
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with lib; {
-    platforms = platforms.linux;
+    platforms = platforms.all;
     description = "C library implementing the OAuth secure authentication protocol";
     homepage = "http://liboauth.sourceforge.net/";
     repositories.git = "https://github.com/x42/liboauth.git";
diff --git a/pkgs/development/libraries/libxmi/default.nix b/pkgs/development/libraries/libxmi/default.nix
index 037e7036f499..b9a2b6de3cc3 100644
--- a/pkgs/development/libraries/libxmi/default.nix
+++ b/pkgs/development/libraries/libxmi/default.nix
@@ -15,7 +15,7 @@ stdenv.mkDerivation {
     description = "Library for rasterizing 2-D vector graphics";
     homepage = "https://www.gnu.org/software/libxmi/";
     license = lib.licenses.gpl2Plus;
-    platforms = lib.platforms.gnu ++ lib.platforms.linux;  # arbitrary choice
+    platforms = lib.platforms.unix;
     maintainers = [ ];
   };
 }
diff --git a/pkgs/development/libraries/libxmp/default.nix b/pkgs/development/libraries/libxmp/default.nix
index 0b953f95d7eb..31a14ff6ae43 100644
--- a/pkgs/development/libraries/libxmp/default.nix
+++ b/pkgs/development/libraries/libxmp/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
       Scream Tracker 3 (S3M), Fast Tracker II (XM), and Impulse Tracker (IT).
     '';
     license     = licenses.lgpl21Plus;
-    platforms   = platforms.linux;
+    platforms   = platforms.all;
   };
 
   src = fetchurl {
diff --git a/pkgs/development/libraries/lightning/default.nix b/pkgs/development/libraries/lightning/default.nix
index 5fdc06bce012..5f8c71fa6aa3 100644
--- a/pkgs/development/libraries/lightning/default.nix
+++ b/pkgs/development/libraries/lightning/default.nix
@@ -27,6 +27,6 @@ stdenv.mkDerivation rec {
     '';
     maintainers = [ maintainers.AndersonTorres ];
     license = licenses.lgpl3Plus;
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/loudmouth/default.nix b/pkgs/development/libraries/loudmouth/default.nix
index 0245417bbf9b..a8d9b23cc84c 100644
--- a/pkgs/development/libraries/loudmouth/default.nix
+++ b/pkgs/development/libraries/loudmouth/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
 
   meta = with lib; {
     description = "A lightweight C library for the Jabber protocol";
-    platforms = platforms.linux;
+    platforms = platforms.all;
     downloadPage = "http://mcabber.com/files/loudmouth/";
     downloadURLRegexp = "loudmouth-[0-9.]+[.]tar[.]bz2$";
     updateWalker = true;
diff --git a/pkgs/development/libraries/lrdf/default.nix b/pkgs/development/libraries/lrdf/default.nix
index 51b2635b89e0..bd78a4329a59 100644
--- a/pkgs/development/libraries/lrdf/default.nix
+++ b/pkgs/development/libraries/lrdf/default.nix
@@ -31,6 +31,6 @@ stdenv.mkDerivation rec {
     homepage = "https://sourceforge.net/projects/lrdf/";
     license = lib.licenses.gpl2;
     maintainers = [ lib.maintainers.marcweber ];
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.unix;
   };
 }
diff --git a/pkgs/development/libraries/metal/default.nix b/pkgs/development/libraries/metal/default.nix
index b98ae8e217c7..2f43485e05e0 100644
--- a/pkgs/development/libraries/metal/default.nix
+++ b/pkgs/development/libraries/metal/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     homepage = "https://github.com/brunocodutra/metal";
     license = licenses.mit;
     maintainers = with maintainers; [ pmiddend ];
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 
 }
diff --git a/pkgs/development/libraries/minixml/default.nix b/pkgs/development/libraries/minixml/default.nix
index 93c03b31a8a7..9bf5235db824 100644
--- a/pkgs/development/libraries/minixml/default.nix
+++ b/pkgs/development/libraries/minixml/default.nix
@@ -17,7 +17,7 @@ stdenv.mkDerivation rec {
     description = "A small XML library";
     homepage = "https://www.msweet.org/mxml/";
     license = licenses.asl20;
-    platforms = platforms.linux;
+    platforms = platforms.all;
     maintainers = [ maintainers.goibhniu ];
   };
 }
diff --git a/pkgs/development/libraries/msgpuck/default.nix b/pkgs/development/libraries/msgpuck/default.nix
index 53fb3bec908c..cc7b056bb988 100644
--- a/pkgs/development/libraries/msgpuck/default.nix
+++ b/pkgs/development/libraries/msgpuck/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
      description = "A simple and efficient MsgPack binary serialization library in a self-contained header file";
      homepage = "https://github.com/rtsisyk/msgpuck";
      license = licenses.bsd2;
-     platforms = platforms.linux;
+     platforms = platforms.all;
      maintainers = with maintainers; [ izorkin ];
  };
 }
diff --git a/pkgs/development/libraries/osip/default.nix b/pkgs/development/libraries/osip/default.nix
index 322ed30a8476..b7cfc5da9d3b 100644
--- a/pkgs/development/libraries/osip/default.nix
+++ b/pkgs/development/libraries/osip/default.nix
@@ -12,7 +12,7 @@ stdenv.mkDerivation rec {
     homepage = "https://www.gnu.org/software/osip/";
     description = "The GNU oSIP library, an implementation of the Session Initiation Protocol (SIP)";
     maintainers = with lib.maintainers; [ raskin ];
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.all;
     inherit version;
   };
 }
diff --git a/pkgs/development/libraries/pxlib/default.nix b/pkgs/development/libraries/pxlib/default.nix
index 3acaf8bac157..4b6b9ada7ab7 100644
--- a/pkgs/development/libraries/pxlib/default.nix
+++ b/pkgs/development/libraries/pxlib/default.nix
@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
     description = "Library to read and write Paradox files";
     homepage = "http://pxlib.sourceforge.net/";
     license = licenses.gpl2;
-    platforms = platforms.linux;
+    platforms = platforms.all;
     maintainers = [ maintainers.winpat ];
   };
 }
diff --git a/pkgs/development/libraries/safefile/default.nix b/pkgs/development/libraries/safefile/default.nix
index db18621d8e43..293a13dbddc4 100644
--- a/pkgs/development/libraries/safefile/default.nix
+++ b/pkgs/development/libraries/safefile/default.nix
@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
     description = "File open routines to safely open a file when in the presence of an attack";
     license = lib.licenses.asl20 ;
     maintainers = [lib.maintainers.raskin];
-    platforms = lib.platforms.linux;
+    platforms = lib.platforms.all;
     homepage = "https://research.cs.wisc.edu/mist/safefile/";
     updateWalker = true;
   };
diff --git a/pkgs/development/libraries/shhmsg/default.nix b/pkgs/development/libraries/shhmsg/default.nix
index 0c736e4cb911..704df3dc5eff 100644
--- a/pkgs/development/libraries/shhmsg/default.nix
+++ b/pkgs/development/libraries/shhmsg/default.nix
@@ -8,13 +8,16 @@ stdenv.mkDerivation rec {
     sha256 = "0ax02fzqpaxr7d30l5xbndy1s5vgg1ag643c7zwiw2wj1czrxil8";
   };
 
+  postPatch = ''
+    substituteInPlace Makefile --replace "gcc" "${stdenv.cc.targetPrefix}cc"
+  '';
+
   installFlags = [ "INSTBASEDIR=$(out)" ];
 
   meta = with lib; {
     description = "A library for displaying messages";
     homepage = "https://shh.thathost.com/pub-unix/";
     license = licenses.artistic1;
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
-
diff --git a/pkgs/development/libraries/shhopt/default.nix b/pkgs/development/libraries/shhopt/default.nix
index da1b820fcd54..0657b13e5579 100644
--- a/pkgs/development/libraries/shhopt/default.nix
+++ b/pkgs/development/libraries/shhopt/default.nix
@@ -8,12 +8,16 @@ stdenv.mkDerivation rec {
     sha256 = "0yd6bl6qw675sxa81nxw6plhpjf9d2ywlm8a5z66zyjf28sl7sds";
   };
 
+  postPatch = ''
+    substituteInPlace Makefile --replace "gcc" "${stdenv.cc.targetPrefix}cc"
+  '';
+
   installFlags = [ "INSTBASEDIR=$(out)" ];
 
   meta = with lib; {
     description = "A library for parsing command line options";
     homepage = "https://shh.thathost.com/pub-unix/";
     license = licenses.artistic1;
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/spglib/default.nix b/pkgs/development/libraries/spglib/default.nix
index 12d696b65a8e..3d1236a03dbb 100644
--- a/pkgs/development/libraries/spglib/default.nix
+++ b/pkgs/development/libraries/spglib/default.nix
@@ -21,6 +21,6 @@ stdenv.mkDerivation rec {
     homepage = "https://atztogo.github.io/spglib/";
     license = licenses.bsd3;
     maintainers = [ maintainers.markuskowa ];
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/spice-protocol/default.nix b/pkgs/development/libraries/spice-protocol/default.nix
index 07b670a2718f..1eaa3398e402 100644
--- a/pkgs/development/libraries/spice-protocol/default.nix
+++ b/pkgs/development/libraries/spice-protocol/default.nix
@@ -19,6 +19,6 @@ stdenv.mkDerivation rec {
     homepage = "https://www.spice-space.org/";
     license = licenses.bsd3;
     maintainers = with maintainers; [ bluescreen303 ];
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/libraries/tidyp/default.nix b/pkgs/development/libraries/tidyp/default.nix
index 5c0ad8463b4a..f4c24a126e5b 100644
--- a/pkgs/development/libraries/tidyp/default.nix
+++ b/pkgs/development/libraries/tidyp/default.nix
@@ -13,7 +13,7 @@ stdenv.mkDerivation rec {
   meta = with lib; {
     description = "A program that can validate your HTML, as well as modify it to be more clean and standard";
     homepage = "http://tidyp.com/";
-    platforms = platforms.linux;
+    platforms = platforms.all;
     maintainers = with maintainers; [ pSub ];
     license = licenses.bsd3;
   };
diff --git a/pkgs/development/tools/analysis/coan/default.nix b/pkgs/development/tools/analysis/coan/default.nix
index 1e0b79e0daa5..3ef6c2b84590 100644
--- a/pkgs/development/tools/analysis/coan/default.nix
+++ b/pkgs/development/tools/analysis/coan/default.nix
@@ -28,6 +28,6 @@ stdenv.mkDerivation rec {
     '';
     homepage = "http://coan2.sourceforge.net/";
     license = licenses.bsd3;
-    platforms = platforms.linux;
+    platforms = platforms.all;
   };
 }
diff --git a/pkgs/development/tools/misc/pwndbg/default.nix b/pkgs/development/tools/misc/pwndbg/default.nix
index 69ed17ab4b9e..764fa6677345 100644
--- a/pkgs/development/tools/misc/pwndbg/default.nix
+++ b/pkgs/development/tools/misc/pwndbg/default.nix
@@ -46,7 +46,7 @@ in stdenv.mkDerivation rec {
     description = "Exploit Development and Reverse Engineering with GDB Made Easy";
     homepage = "https://github.com/pwndbg/pwndbg";
     license = licenses.mit;
-    platforms = platforms.linux;
+    platforms = platforms.all;
     maintainers = with maintainers; [ mic92 ];
   };
 }
diff --git a/pkgs/games/vassal/default.nix b/pkgs/games/vassal/default.nix
index 2a916094af41..cc9e9bd98562 100644
--- a/pkgs/games/vassal/default.nix
+++ b/pkgs/games/vassal/default.nix
@@ -31,6 +31,6 @@ stdenv.mkDerivation rec {
       homepage = "http://www.vassalengine.org/";
       license = licenses.lgpl21Only;
       maintainers = with maintainers; [ tvestelind ];
-      platforms = platforms.linux;
+      platforms = platforms.unix;
   };
 }