Merge commit '3ab2949' from staging into master

Conflicts:
	pkgs/development/compilers/llvm/6/llvm.nix
	pkgs/servers/home-assistant/component-packages.nix

pkgs/tools/text/gawk/default.nix

@@ -19,11 +19,11 @@ let
   inherit (stdenv.lib) optional;
 in
 stdenv.mkDerivation rec {
-  name = "gawk-4.2.0";
+  name = "gawk-4.2.1";
 
   src = fetchurl {
     url = "mirror://gnu/gawk/${name}.tar.xz";
-    sha256 = "1wm9lqj77y7xz07zi0n187aqm8zavzxzpm1j53ahxz81q0qwvwyl";
+    sha256 = "0lam2zf3n7ak4pig8w46lhx9hzx50kj2v2yj1616mm26wy2rf4fi";
   };
 
   # When we do build separate interactive version, it makes sense to always include man.

pkgs/tools/text/groff/default.nix

@@ -47,7 +47,7 @@ stdenv.mkDerivation rec {
   ] ++ stdenv.lib.optionals (ghostscript != null) [
     "--with-gs=${ghostscript}/bin/gs"
   ] ++ stdenv.lib.optionals (stdenv.buildPlatform != stdenv.hostPlatform) [
-    "ac_cv_path_PERL=${perl}/bin/perl"
+    "ac_cv_path_PERL=${buildPackages.perl}/bin/perl"
   ];
 
   doCheck = true;
@@ -103,6 +103,8 @@ stdenv.mkDerivation rec {
     substituteInPlace $perl/bin/grog \
       --replace $out/lib/groff/grog $perl/lib/groff/grog
 
+  '' + stdenv.lib.optionalString (stdenv.buildPlatform != stdenv.hostPlatform) ''
+    find $perl/ -type f -print0 | xargs --null sed -i 's|${buildPackages.perl}|${perl}|'
   '';
 
   meta = with stdenv.lib; {