diff --git a/nixos/modules/programs/zsh/zsh.nix b/nixos/modules/programs/zsh/zsh.nix
index 049a315c762..e0335643b6e 100644
--- a/nixos/modules/programs/zsh/zsh.nix
+++ b/nixos/modules/programs/zsh/zsh.nix
@@ -53,7 +53,7 @@ in
       };
 
       shellAliases = mkOption {
-        default = {};
+        default = { };
         description = ''
           Set of aliases for zsh shell, which overrides <option>environment.shellAliases</option>.
           See <option>environment.shellAliases</option> for an option format description.
@@ -118,7 +118,9 @@ in
       setOptions = mkOption {
         type = types.listOf types.str;
         default = [
-          "HIST_IGNORE_DUPS" "SHARE_HISTORY" "HIST_FCNTL_LOCK"
+          "HIST_IGNORE_DUPS"
+          "SHARE_HISTORY"
+          "HIST_FCNTL_LOCK"
         ];
         example = [ "EXTENDED_HISTORY" "RM_STAR_WAIT" ];
         description = ''
@@ -278,15 +280,29 @@ in
 
     environment.etc.zinputrc.source = ./zinputrc;
 
-    environment.systemPackages = [ pkgs.zsh ]
-      ++ optional cfg.enableCompletion pkgs.nix-zsh-completions;
+    environment.systemPackages =
+      let
+        completions =
+          if lib.versionAtLeast (lib.getVersion config.nix.package) "2.4pre"
+          then
+            pkgs.nix-zsh-completions.overrideAttrs
+              (_: {
+                postInstall = ''
+                  rm $out/share/zsh/site-functions/_nix
+                '';
+              })
+          else pkgs.nix-zsh-completions;
+      in
+      [ pkgs.zsh ]
+      ++ optional cfg.enableCompletion completions;
 
     environment.pathsToLink = optional cfg.enableCompletion "/share/zsh";
 
     #users.defaultUserShell = mkDefault "/run/current-system/sw/bin/zsh";
 
     environment.shells =
-      [ "/run/current-system/sw/bin/zsh"
+      [
+        "/run/current-system/sw/bin/zsh"
         "${pkgs.zsh}/bin/zsh"
       ];
 
diff --git a/pkgs/games/steam/runtime.nix b/pkgs/games/steam/runtime.nix
index ab2c19249aa..a986e1baa2c 100644
--- a/pkgs/games/steam/runtime.nix
+++ b/pkgs/games/steam/runtime.nix
@@ -8,11 +8,11 @@ stdenv.mkDerivation rec {
 
   pname = "steam-runtime";
   # from https://repo.steampowered.com/steamrt-images-scout/snapshots/
-  version = "0.20210527.0";
+  version = "0.20210630.0";
 
   src = fetchurl {
     url = "https://repo.steampowered.com/steamrt-images-scout/snapshots/${version}/steam-runtime.tar.xz";
-    sha256 = "1880d1byn265w0vy5p98d8w8virnbywj707ydybj7rixhid2gzdc";
+    sha256 = "sha256-vwSgk3hEaI/RO9uvehAx3+ZBynpqjwGDzuyeyGCnu18=";
     name = "scout-runtime-${version}.tar.gz";
   };
 
diff --git a/pkgs/tools/archivers/lha/default.nix b/pkgs/tools/archivers/lha/default.nix
new file mode 100644
index 00000000000..f6b5c2bd135
--- /dev/null
+++ b/pkgs/tools/archivers/lha/default.nix
@@ -0,0 +1,27 @@
+{stdenv, lib, fetchFromGitHub, autoreconfHook}:
+
+stdenv.mkDerivation {
+  pname = "lha";
+  version = "unstable-2021-01-07";
+
+  src = fetchFromGitHub {
+    owner = "jca02266";
+    repo = "lha";
+    rev = "03475355bc6311f7f816ea9a88fb34a0029d975b";
+    sha256 = "18w2x0g5yq89yxkxh1fmb05lz4hw7a3b4jmkk95gvh11mwbbr5lm";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+
+  meta = with lib; {
+    description = "LHa is an archiver and compressor using the LZSS and Huffman encoding compression algorithms";
+    platforms = platforms.unix;
+    maintainers = [ maintainers.sander ];
+    # Some of the original LhA code has been rewritten and the current author
+    # considers adopting a "true" free and open source license for it.
+    # However, old code is still covered by the original LHa license, which is
+    # not a free software license (it has additional requirements on commercial
+    # use).
+    license = licenses.unfree;
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c9267112f6f..f1a9b11728a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6127,6 +6127,8 @@ in
 
   lf = callPackage ../tools/misc/lf {};
 
+  lha = callPackage ../tools/archivers/lha { };
+
   lhasa = callPackage ../tools/compression/lhasa {};
 
   libcpuid = callPackage ../tools/misc/libcpuid { };