diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index 324599e4982..e8892e17b71 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -251,24 +251,13 @@ stdenv.mkDerivation ({
     ++ optionals javaAwtGtk [ gmp mpfr ]
   ));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index 9d4d8a9b6ac..4f6d32b3317 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -257,24 +257,13 @@ stdenv.mkDerivation ({
     ++ optionals javaAwtGtk [ gmp mpfr ]
   ));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index d809c6c4e36..3c8cdde8103 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -264,24 +264,13 @@ stdenv.mkDerivation ({
     ++ optionals javaAwtGtk [ gmp mpfr ]
   ));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index 1eec43cb320..82cec33756d 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -266,24 +266,13 @@ stdenv.mkDerivation ({
     ++ optionals javaAwtGtk [ gmp mpfr ]
   ));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 7a4b0ed3222..c500bb477a2 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -230,24 +230,13 @@ stdenv.mkDerivation ({
 
   LIBRARY_PATH = optionals (targetPlatform == hostPlatform) (makeLibraryPath (optional (zlib != null) zlib));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/development/compilers/gcc/8/default.nix b/pkgs/development/compilers/gcc/8/default.nix
index c0df37bd5f8..6ce10a78427 100644
--- a/pkgs/development/compilers/gcc/8/default.nix
+++ b/pkgs/development/compilers/gcc/8/default.nix
@@ -212,24 +212,13 @@ stdenv.mkDerivation ({
 
   LIBRARY_PATH = optionals (targetPlatform == hostPlatform) (makeLibraryPath (optional (zlib != null) zlib));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/development/compilers/gcc/9/default.nix b/pkgs/development/compilers/gcc/9/default.nix
index 23a5eeafb8b..0e78cffdef2 100644
--- a/pkgs/development/compilers/gcc/9/default.nix
+++ b/pkgs/development/compilers/gcc/9/default.nix
@@ -211,24 +211,13 @@ stdenv.mkDerivation ({
 
   LIBRARY_PATH = optionals (targetPlatform == hostPlatform) (makeLibraryPath (optional (zlib != null) zlib));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/development/compilers/gcc/common/configure-flags.nix b/pkgs/development/compilers/gcc/common/configure-flags.nix
index 0707e087178..a0c9941e3c6 100644
--- a/pkgs/development/compilers/gcc/common/configure-flags.nix
+++ b/pkgs/development/compilers/gcc/common/configure-flags.nix
@@ -49,7 +49,7 @@ let
       "--disable-decimal-float" # requires libc
       "--disable-libmpx" # requires libc
     ] ++ lib.optionals crossMingw [
-      "--with-headers=${libcCross}/include"
+      "--with-headers=${lib.getDev libcCross}/include"
       "--with-gcc"
       "--with-gnu-as"
       "--with-gnu-ld"
diff --git a/pkgs/development/compilers/gcc/common/extra-target-flags.nix b/pkgs/development/compilers/gcc/common/extra-target-flags.nix
new file mode 100644
index 00000000000..1c2fad8fbc5
--- /dev/null
+++ b/pkgs/development/compilers/gcc/common/extra-target-flags.nix
@@ -0,0 +1,28 @@
+{ stdenv, crossStageStatic, libcCross }:
+
+let
+  inherit (stdenv) lib hostPlatform targetPlatform;
+in
+
+{
+  EXTRA_TARGET_FLAGS = let
+      mkFlags = dep: lib.optionals (targetPlatform != hostPlatform && dep != null) ([
+        "-idirafter ${lib.getDev dep}${dep.incdir or "/include"}"
+      ] ++ stdenv.lib.optionals (! crossStageStatic) [
+        "-B${lib.getLib dep}${dep.libdir or "/lib"}"
+      ]);
+    in mkFlags libcCross
+    ;
+
+  EXTRA_TARGET_LDFLAGS = let
+      mkFlags = dep: lib.optionals (targetPlatform != hostPlatform && dep != null) ([
+        "-Wl,-L${lib.getLib dep}${dep.libdir or "/lib"}"
+      ] ++ (if crossStageStatic then [
+          "-B${lib.getLib dep}${dep.libdir or "/lib"}"
+        ] else [
+          "-Wl,-rpath,${lib.getLib dep}${dep.libdir or "/lib"}"
+          "-Wl,-rpath-link,${lib.getLib dep}${dep.libdir or "/lib"}"
+      ]));
+    in mkFlags libcCross
+    ;
+}
diff --git a/pkgs/development/compilers/gcc/snapshot/default.nix b/pkgs/development/compilers/gcc/snapshot/default.nix
index d073edfb09c..f431df03549 100644
--- a/pkgs/development/compilers/gcc/snapshot/default.nix
+++ b/pkgs/development/compilers/gcc/snapshot/default.nix
@@ -184,24 +184,13 @@ stdenv.mkDerivation ({
 
   LIBRARY_PATH = optionals (targetPlatform == hostPlatform) (makeLibraryPath (optional (zlib != null) zlib));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]);
-
-  EXTRA_TARGET_LDFLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
-    ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
-      ] else [
-        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
-        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
-    ]));
+  inherit
+    (import ../common/extra-target-flags.nix {
+      inherit stdenv crossStageStatic libcCross;
+    })
+    EXTRA_TARGET_FLAGS
+    EXTRA_TARGET_LDFLAGS
+    ;
 
   passthru = {
     inherit langC langCC langObjC langObjCpp langFortran langGo version;
diff --git a/pkgs/os-specific/windows/mingw-w64/default.nix b/pkgs/os-specific/windows/mingw-w64/default.nix
index 022aaffe596..7efc2e21313 100644
--- a/pkgs/os-specific/windows/mingw-w64/default.nix
+++ b/pkgs/os-specific/windows/mingw-w64/default.nix
@@ -11,11 +11,15 @@ in stdenv.mkDerivation {
     sha256 = "00zq3z1hbzd5yzmskskjg79xrzwsqx7ihyprfaxy4hb897vf29sm";
   };
 
+  outputs = [ "out" "dev" ];
+
   configureFlags = [
     "--enable-idl"
     "--enable-secure-api"
   ];
 
+  enableParallelBuilding = true;
+
   buildInputs = [ windows.mingw_w64_headers ];
   dontStrip = true;
   hardeningDisable = [ "stackprotector" "fortify" ];