diff --git a/lib/systems/examples.nix b/lib/systems/examples.nix
index e19143543902..2bfa9700ccd1 100644
--- a/lib/systems/examples.nix
+++ b/lib/systems/examples.nix
@@ -99,9 +99,23 @@ rec {
   riscv64 = riscv "64";
   riscv32 = riscv "32";
 
-  arduino-uno = {
+  avr = {
     config = "avr";
-    platform = { name = "avr5"; };
+  };
+
+  arm-embedded = {
+    config = "arm-none-eabi";
+    libc = "newlib";
+  };
+
+  aarch64-embedded = {
+    config = "aarch64-none-elf";
+    libc = "newlib";
+  };
+
+  ppc-embedded = {
+    config = "powerpc-none-eabi";
+    libc = "newlib";
   };
 
   #
diff --git a/pkgs/build-support/bintools-wrapper/default.nix b/pkgs/build-support/bintools-wrapper/default.nix
index 99f556b973a1..3ac1e52f3092 100644
--- a/pkgs/build-support/bintools-wrapper/default.nix
+++ b/pkgs/build-support/bintools-wrapper/default.nix
@@ -210,7 +210,7 @@ stdenv.mkDerivation {
       ## General libc support
       ##
 
-      echo "-L${libc_lib}/lib" > $out/nix-support/libc-ldflags
+      echo "-L${libc_lib}${libc.libdir or "/lib"}" > $out/nix-support/libc-ldflags
 
       echo "${libc_lib}" > $out/nix-support/orig-libc
       echo "${libc_dev}" > $out/nix-support/orig-libc-dev
@@ -293,6 +293,16 @@ stdenv.mkDerivation {
       hardening_unsupported_flags+=" pic"
     ''
 
+    + optionalString targetPlatform.isAvr ''
+      hardening_unsupported_flags+=" relro bindnow"
+    ''
+
+    + optionalString (libc != null && targetPlatform.isAvr) ''
+      for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
+        echo "-L${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags
+      done
+    ''
+
     + ''
       set +u
       substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
diff --git a/pkgs/build-support/cc-wrapper/default.nix b/pkgs/build-support/cc-wrapper/default.nix
index e59758371a38..06aa9436bfc0 100644
--- a/pkgs/build-support/cc-wrapper/default.nix
+++ b/pkgs/build-support/cc-wrapper/default.nix
@@ -232,7 +232,7 @@ stdenv.mkDerivation {
       # compile, because it uses "#include_next <limits.h>" to find the
       # limits.h file in ../includes-fixed. To remedy the problem,
       # another -idirafter is necessary to add that directory again.
-      echo "-B${libc_lib}/lib/ -idirafter ${libc_dev}/include ${optionalString isGNU "-idirafter ${cc}/lib/gcc/*/*/include-fixed"}" > $out/nix-support/libc-cflags
+      echo "-B${libc_lib}${libc.libdir or "/lib/"} -idirafter ${libc_dev}${libc.incdir or "/include"} ${optionalString isGNU "-idirafter ${cc}/lib/gcc/*/*/include-fixed"}" > $out/nix-support/libc-cflags
 
       echo "${libc_lib}" > $out/nix-support/orig-libc
       echo "${libc_dev}" > $out/nix-support/orig-libc-dev
@@ -284,6 +284,20 @@ stdenv.mkDerivation {
       hardening_unsupported_flags+=" stackprotector"
     ''
 
+    + optionalString targetPlatform.isAvr ''
+      hardening_unsupported_flags+=" stackprotector pic"
+    ''
+
+    + optionalString (targetPlatform.libc == "newlib") ''
+      hardening_unsupported_flags+=" stackprotector fortify pie pic"
+    ''
+
+    + optionalString (libc != null && targetPlatform.isAvr) ''
+      for isa in avr5 avr3 avr4 avr6 avr25 avr31 avr35 avr51 avrxmega2 avrxmega4 avrxmega5 avrxmega6 avrxmega7 tiny-stack; do
+        echo "-B${getLib libc}/avr/lib/$isa" >> $out/nix-support/libc-cflags
+      done
+    ''
+
     + ''
       substituteAll ${./add-flags.sh} $out/nix-support/add-flags.sh
       substituteAll ${./add-hardening.sh} $out/nix-support/add-hardening.sh
diff --git a/pkgs/development/compilers/gcc/4.8/default.nix b/pkgs/development/compilers/gcc/4.8/default.nix
index d9376f597a70..e585f296e877 100644
--- a/pkgs/development/compilers/gcc/4.8/default.nix
+++ b/pkgs/development/compilers/gcc/4.8/default.nix
@@ -130,7 +130,7 @@ let version = "4.8.5";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -148,10 +148,15 @@ let version = "4.8.5";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -270,7 +275,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -360,20 +365,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${libcCross.dev}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru = {
diff --git a/pkgs/development/compilers/gcc/4.9/default.nix b/pkgs/development/compilers/gcc/4.9/default.nix
index c60f54f1560c..9dae061ecbb3 100644
--- a/pkgs/development/compilers/gcc/4.9/default.nix
+++ b/pkgs/development/compilers/gcc/4.9/default.nix
@@ -135,7 +135,7 @@ let version = "4.9.4";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -156,10 +156,15 @@ let version = "4.9.4";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -292,7 +297,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -381,20 +386,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/5/default.nix b/pkgs/development/compilers/gcc/5/default.nix
index 47c849d2dcc8..fbc192752c72 100644
--- a/pkgs/development/compilers/gcc/5/default.nix
+++ b/pkgs/development/compilers/gcc/5/default.nix
@@ -122,7 +122,7 @@ let version = "5.5.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -143,10 +143,15 @@ let version = "5.5.0";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -296,7 +301,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -387,20 +392,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/6/default.nix b/pkgs/development/compilers/gcc/6/default.nix
index eeb57be97157..793752dee19e 100644
--- a/pkgs/development/compilers/gcc/6/default.nix
+++ b/pkgs/development/compilers/gcc/6/default.nix
@@ -120,7 +120,7 @@ let version = "6.4.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -143,10 +143,15 @@ let version = "6.4.0";
             "--disable-libgomp"
             # musl at least, disable: https://git.buildroot.net/buildroot/commit/?id=873d4019f7fb00f6a80592224236b3ba7d657865
             "--disable-libmpx"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
@@ -301,7 +306,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -391,20 +396,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/7/default.nix b/pkgs/development/compilers/gcc/7/default.nix
index 59897ccff426..c75a6c6e68f8 100644
--- a/pkgs/development/compilers/gcc/7/default.nix
+++ b/pkgs/development/compilers/gcc/7/default.nix
@@ -67,7 +67,7 @@ let version = "7.3.0";
       [ "--with-as=${targetPackages.stdenv.cc.bintools}/bin/${targetPlatform.config}-as"
         "--with-ld=${targetPackages.stdenv.cc.bintools}/bin/${targetPlatform.config}-ld" ] ++
       (if crossMingw && crossStageStatic then [
-        "--with-headers=${libcCross}/include"
+        "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}"
         "--with-gcc"
         "--with-gnu-as"
         "--with-gnu-ld"
@@ -92,7 +92,7 @@ let version = "7.3.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -115,11 +115,17 @@ let version = "7.3.0";
             "--disable-libgomp"
             # musl at least, disable: https://git.buildroot.net/buildroot/commit/?id=873d4019f7fb00f6a80592224236b3ba7d657865
             "--disable-libmpx"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
-        ]));
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            # No final libdecnumber (it may work only in 386)
+            "--disable-decimal-float"
+          ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "${targetPlatform.config}${stageNameAddon}-" else "";
 
@@ -188,7 +194,12 @@ stdenv.mkDerivation ({
             sed -i gcc/config/linux.h -e '1i#undef LOCAL_INCLUDE_DIR'
         ''
         )
-    else "");
+    else "")
+      + stdenv.lib.optionalString targetPlatform.isAvr ''
+        makeFlagsArray+=(
+           'LIMITS_H_TEST=false'
+        )
+      '';
 
   inherit noSysDirs staticCompiler crossStageStatic
     libcCross crossMingw;
@@ -267,7 +278,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -334,20 +345,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/8/default.nix b/pkgs/development/compilers/gcc/8/default.nix
index 7842110a2146..bcac577712aa 100644
--- a/pkgs/development/compilers/gcc/8/default.nix
+++ b/pkgs/development/compilers/gcc/8/default.nix
@@ -87,7 +87,7 @@ let version = "8.2.0";
         "--disable-libmpx" # requires libc
       ] else [
         (if crossDarwin then "--with-sysroot=${getLib libcCross}/share/sysroot"
-         else                "--with-headers=${getDev libcCross}/include")
+         else                "--with-headers=${getDev libcCross}${libcCross.incdir or "/include"}")
         "--enable-__cxa_atexit"
         "--enable-long-long"
       ] ++
@@ -110,10 +110,15 @@ let version = "8.2.0";
             "--disable-libgomp"
             # musl at least, disable: https://git.buildroot.net/buildroot/commit/?id=873d4019f7fb00f6a80592224236b3ba7d657865
             "--disable-libmpx"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
@@ -261,7 +266,7 @@ stdenv.mkDerivation ({
       }"
     ] ++
 
-    (if enableMultilib
+    (if (enableMultilib || targetPlatform.isAvr)
       then ["--enable-multilib" "--disable-libquadmath"]
       else ["--disable-multilib"]) ++
     optional (!enableShared) "--disable-shared" ++
@@ -322,23 +327,16 @@ stdenv.mkDerivation ({
 
   LIBRARY_PATH = optionals (targetPlatform == hostPlatform) (makeLibraryPath (optional (zlib != null) zlib));
 
-  EXTRA_TARGET_FLAGS = optionals
-    (targetPlatform != hostPlatform && libcCross != null)
-    ([
-      "-idirafter ${getDev libcCross}/include"
-    ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
-    ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/compilers/gcc/snapshot/default.nix b/pkgs/development/compilers/gcc/snapshot/default.nix
index 0de6be36c351..a308abd9c16f 100644
--- a/pkgs/development/compilers/gcc/snapshot/default.nix
+++ b/pkgs/development/compilers/gcc/snapshot/default.nix
@@ -104,10 +104,15 @@ let version = "7-20170409";
             # In uclibc cases, libgomp needs an additional '-ldl'
             # and as I don't know how to pass it, I disable libgomp.
             "--disable-libgomp"
-          ] ++ [
-          "--enable-threads=posix"
-          "--enable-nls"
-          "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
+          ]
+          ++ optional (targetPlatform.libc == "newlib") "--with-newlib"
+          ++ optional (targetPlatform.libc == "avrlibc") "--with-avrlibc"
+          ++ [
+            "--enable-threads=${if targetPlatform.isUnix then "posix"
+                                else if targetPlatform.isWindows then "win32"
+                                else "single"}"
+            "--enable-nls"
+            "--disable-decimal-float" # No final libdecnumber (it may work only in 386)
         ]));
     stageNameAddon = if crossStageStatic then "-stage-static" else "-stage-final";
     crossNameAddon = if targetPlatform != hostPlatform then "-${targetPlatform.config}" + stageNameAddon else "";
@@ -290,20 +295,20 @@ stdenv.mkDerivation ({
   EXTRA_TARGET_FLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-idirafter ${getDev libcCross}/include"
+      "-idirafter ${getDev libcCross}${libcCross.incdir or "/include"}"
     ] ++ optionals (! crossStageStatic) [
-      "-B${libcCross.out}/lib"
+      "-B${libcCross.out}${libcCross.libdir or "/lib"}"
     ]);
 
   EXTRA_TARGET_LDFLAGS = optionals
     (targetPlatform != hostPlatform && libcCross != null)
     ([
-      "-Wl,-L${libcCross.out}/lib"
+      "-Wl,-L${libcCross.out}${libcCross.libdir or "/lib"}"
     ] ++ (if crossStageStatic then [
-        "-B${libcCross.out}/lib"
+        "-B${libcCross.out}${libcCross.libdir or "/lib"}"
       ] else [
-        "-Wl,-rpath,${libcCross.out}/lib"
-        "-Wl,-rpath-link,${libcCross.out}/lib"
+        "-Wl,-rpath,${libcCross.out}${libcCross.libdir or "/lib"}"
+        "-Wl,-rpath-link,${libcCross.out}${libcCross.libdir or "/lib"}"
     ]));
 
   passthru =
diff --git a/pkgs/development/misc/avr/libc/default.nix b/pkgs/development/misc/avr/libc/default.nix
index 9bfffe7b2fee..afe30e4b5eef 100644
--- a/pkgs/development/misc/avr/libc/default.nix
+++ b/pkgs/development/misc/avr/libc/default.nix
@@ -14,9 +14,13 @@ stdenv.mkDerivation {
   nativeBuildInputs = [ automake autoconf ];
 
   # Make sure we don't strip the libraries in lib/gcc/avr.
-  stripDebugList= "bin";
+  stripDebugList = "bin";
   dontPatchELF = true;
 
+  passthru = {
+    incdir = "/avr/include";
+  };
+
   meta = with stdenv.lib; {
     description = "a C runtime library for AVR microcontrollers";
     homepage = http://savannah.nongnu.org/projects/avr-libc/;