Merge master into staging

This is to cleanup the (re-)revert of merge to master.

pkgs/development/interpreters/dhall/default.nix

@@ -0,0 +1,18 @@
+{ haskell, haskellPackages, stdenvNoCC }:
+
+let
+  static = haskell.lib.justStaticExecutables haskellPackages.dhall;
+
+in static.overrideAttrs (old: {
+  passthru = old.passthru or {} // {
+    prelude = stdenvNoCC.mkDerivation {
+      name = "dhall-prelude";
+      inherit (old) src;
+      phases = [ "unpackPhase" "installPhase" ];
+      installPhase = ''
+        mkdir $out
+        cp -r Prelude/* $out/
+      '';
+    };
+  };
+})

pkgs/development/interpreters/perl/default.nix

@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurlBoot, buildPackages, enableThreading ? stdenv ? glibc }:
+{ lib, stdenv, fetchurlBoot, buildPackages, enableThreading ? stdenv ? glibc, fetchpatch }:
 
 with lib;
 
@@ -133,12 +133,19 @@ let
       sha256 = "072j491rpz2qx2sngbg4flqh4lx5865zyql7b9lqm6s1kknjdrh8";
     };
 
-    # Hacky! But not sure how else we can access a native-targeted gcc6
     # https://github.com/arsv/perl-cross/issues/60
-    nativeBuildInputs = [ buildPackages.buildPackages.gcc6 ];
+    perl-cross-gcc7-patch = fetchpatch {
+      url = "https://github.com/arsv/perl-cross/commit/07208bc1707b8be3ea170c62c59120020cf0f87f.patch";
+      sha256 = "1gh8w9m5if2s0lrx2x8f8grp74d1l6d46m8jglpjm5a1kf55j810";
+    };
+
+    depsBuildBuild = [ buildPackages.stdenv.cc ];
 
     postUnpack = ''
       unpackFile ${perl-cross-src}
+      cd perl-cross-*
+      patch -Np1 -i ${perl-cross-gcc7-patch}
+      cd ..
       cp -R perl-cross-${crossVersion}/* perl-${version}/
     '';