diff --git a/nixos/modules/module-list.nix b/nixos/modules/module-list.nix
index 0f8a7ba7904..911f0434e1b 100644
--- a/nixos/modules/module-list.nix
+++ b/nixos/modules/module-list.nix
@@ -349,6 +349,7 @@
   ./services/editors/emacs.nix
   ./services/editors/infinoted.nix
   ./services/games/factorio.nix
+  ./services/games/freeciv.nix
   ./services/games/minecraft-server.nix
   ./services/games/minetest-server.nix
   ./services/games/openarena.nix
diff --git a/nixos/modules/services/games/freeciv.nix b/nixos/modules/services/games/freeciv.nix
new file mode 100644
index 00000000000..4923891a617
--- /dev/null
+++ b/nixos/modules/services/games/freeciv.nix
@@ -0,0 +1,187 @@
+{ config, lib, pkgs, ... }:
+with lib;
+let
+  cfg = config.services.freeciv;
+  inherit (config.users) groups;
+  rootDir = "/run/freeciv";
+  argsFormat = {
+    type = with lib.types; let
+      valueType = nullOr (oneOf [
+        bool int float str
+        (listOf valueType)
+      ]) // {
+        description = "freeciv-server params";
+      };
+    in valueType;
+    generate = name: value:
+      let mkParam = k: v:
+            if v == null then []
+            else if isBool v then if v then [("--"+k)] else []
+            else [("--"+k) v];
+          mkParams = k: v: map (mkParam k) (if isList v then v else [v]);
+      in escapeShellArgs (concatLists (concatLists (mapAttrsToList mkParams value)));
+  };
+in
+{
+  options = {
+    services.freeciv = {
+      enable = mkEnableOption ''freeciv'';
+      settings = mkOption {
+        description = ''
+          Parameters of freeciv-server.
+        '';
+        default = {};
+        type = types.submodule {
+          freeformType = argsFormat.type;
+          options.Announce = mkOption {
+            type = types.enum ["IPv4" "IPv6" "none"];
+            default = "none";
+            description = "Announce game in LAN using given protocol.";
+          };
+          options.auth = mkEnableOption "server authentication";
+          options.Database = mkOption {
+            type = types.nullOr types.str;
+            apply = pkgs.writeText "auth.conf";
+            default = ''
+              [fcdb]
+                backend="sqlite"
+                database="/var/lib/freeciv/auth.sqlite"
+            '';
+            description = "Enable database connection with given configuration.";
+          };
+          options.debug = mkOption {
+            type = types.ints.between 0 3;
+            default = 0;
+            description = "Set debug log level.";
+          };
+          options.exit-on-end = mkEnableOption "exit instead of restarting when a game ends.";
+          options.Guests = mkEnableOption "guests to login if auth is enabled";
+          options.Newusers = mkEnableOption "new users to login if auth is enabled";
+          options.port = mkOption {
+            type = types.port;
+            default = 5556;
+            description = "Listen for clients on given port";
+          };
+          options.quitidle = mkOption {
+            type = types.nullOr types.int;
+            default = null;
+            description = "Quit if no players for given time in seconds.";
+          };
+          options.read = mkOption {
+            type = types.lines;
+            apply = v: pkgs.writeTextDir "read.serv" v + "/read";
+            default = ''
+              /fcdb lua sqlite_createdb()
+            '';
+            description = "Startup script.";
+          };
+          options.saves = mkOption {
+            type = types.nullOr types.str;
+            default = "/var/lib/freeciv/saves/";
+            description = ''
+              Save games to given directory,
+              a sub-directory named after the starting date of the service
+              will me inserted to preserve older saves.
+            '';
+          };
+        };
+      };
+      openFirewall = mkEnableOption "opening the firewall for the port listening for clients";
+    };
+  };
+  config = mkIf cfg.enable {
+    users.groups.freeciv = {};
+    # Use with:
+    #   journalctl -u freeciv.service -f -o cat &
+    #   cat >/run/freeciv.stdin
+    #   load saves/2020-11-14_05-22-27/freeciv-T0005-Y-3750-interrupted.sav.bz2
+    systemd.sockets.freeciv = {
+      wantedBy = [ "sockets.target" ];
+      socketConfig = {
+        ListenFIFO = "/run/freeciv.stdin";
+        SocketGroup = groups.freeciv.name;
+        SocketMode = "660";
+        RemoveOnStop = true;
+      };
+    };
+    systemd.services.freeciv = {
+      description = "Freeciv Service";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      environment.HOME = "/var/lib/freeciv";
+      serviceConfig = {
+        Restart = "on-failure";
+        RestartSec = "5s";
+        StandardInput = "fd:freeciv.socket";
+        StandardOutput = "journal";
+        StandardError = "journal";
+        ExecStart = pkgs.writeShellScript "freeciv-server" (''
+          set -eux
+          savedir=$(date +%Y-%m-%d_%H-%M-%S)
+          '' + "${pkgs.freeciv}/bin/freeciv-server"
+          + " " + optionalString (cfg.settings.saves != null)
+            (concatStringsSep " " [ "--saves" "${escapeShellArg cfg.settings.saves}/$savedir" ])
+          + " " + argsFormat.generate "freeciv-server" (cfg.settings // { saves = null; }));
+        DynamicUser = true;
+        # Create rootDir in the host's mount namespace.
+        RuntimeDirectory = [(baseNameOf rootDir)];
+        RuntimeDirectoryMode = "755";
+        StateDirectory = [ "freeciv" ];
+        WorkingDirectory = "/var/lib/freeciv";
+        # Avoid mounting rootDir in the own rootDir of ExecStart='s mount namespace.
+        InaccessiblePaths = ["-+${rootDir}"];
+        # This is for BindPaths= and BindReadOnlyPaths=
+        # to allow traversal of directories they create in RootDirectory=.
+        UMask = "0066";
+        RootDirectory = rootDir;
+        RootDirectoryStartOnly = true;
+        MountAPIVFS = true;
+        BindReadOnlyPaths = [
+          builtins.storeDir
+          "/etc"
+          "/run"
+        ];
+        # The following options are only for optimizing:
+        # systemd-analyze security freeciv
+        AmbientCapabilities = "";
+        CapabilityBoundingSet = "";
+        # ProtectClock= adds DeviceAllow=char-rtc r
+        DeviceAllow = "";
+        LockPersonality = true;
+        MemoryDenyWriteExecute = true;
+        NoNewPrivileges = true;
+        PrivateDevices = true;
+        PrivateMounts = true;
+        PrivateNetwork = mkDefault false;
+        PrivateTmp = true;
+        PrivateUsers = true;
+        ProtectClock = true;
+        ProtectControlGroups = true;
+        ProtectHome = true;
+        ProtectHostname = true;
+        ProtectKernelLogs = true;
+        ProtectKernelModules = true;
+        ProtectKernelTunables = true;
+        ProtectSystem = "strict";
+        RemoveIPC = true;
+        RestrictAddressFamilies = [ "AF_INET" "AF_INET6" ];
+        RestrictNamespaces = true;
+        RestrictRealtime = true;
+        RestrictSUIDSGID = true;
+        SystemCallFilter = [
+          "@system-service"
+          # Groups in @system-service which do not contain a syscall listed by:
+          # perf stat -x, 2>perf.log -e 'syscalls:sys_enter_*' freeciv-server
+          # in tests, and seem likely not necessary for freeciv-server.
+          "~@aio" "~@chown" "~@ipc" "~@keyring" "~@memlock"
+          "~@resources" "~@setuid" "~@sync" "~@timer"
+        ];
+        SystemCallArchitectures = "native";
+        SystemCallErrorNumber = "EPERM";
+      };
+    };
+    networking.firewall = mkIf cfg.openFirewall
+      { allowedTCPPorts = [ cfg.settings.port ]; };
+  };
+  meta.maintainers = with lib.maintainers; [ julm ];
+}
diff --git a/nixos/modules/services/misc/cgminer.nix b/nixos/modules/services/misc/cgminer.nix
index b80a4746fd1..662570f9451 100644
--- a/nixos/modules/services/misc/cgminer.nix
+++ b/nixos/modules/services/misc/cgminer.nix
@@ -41,12 +41,14 @@ in
       };
 
       user = mkOption {
+        type = types.str;
         default = "cgminer";
         description = "User account under which cgminer runs";
       };
 
       pools = mkOption {
         default = [];  # Run benchmark
+        type = types.listOf (types.attrsOf types.str);
         description = "List of pools where to mine";
         example = [{
           url = "http://p2pool.org:9332";
@@ -57,6 +59,7 @@ in
 
       hardware = mkOption {
         default = []; # Run without options
+        type = types.listOf (types.attrsOf (types.either types.str types.int));
         description= "List of config options for every GPU";
         example = [
         {
@@ -83,6 +86,7 @@ in
 
       config = mkOption {
         default = {};
+        type = (types.either types.bool types.int);
         description = "Additional config";
         example = {
           auto-fan = true;
diff --git a/pkgs/build-support/bintools-wrapper/default.nix b/pkgs/build-support/bintools-wrapper/default.nix
index e960a245528..48a3ebb32df 100644
--- a/pkgs/build-support/bintools-wrapper/default.nix
+++ b/pkgs/build-support/bintools-wrapper/default.nix
@@ -57,6 +57,7 @@ let
     else if targetPlatform.libc == "nblibc"           then "${libc_lib}/libexec/ld.elf_so"
     else if targetPlatform.system == "i686-linux"     then "${libc_lib}/lib/ld-linux.so.2"
     else if targetPlatform.system == "x86_64-linux"   then "${libc_lib}/lib/ld-linux-x86-64.so.2"
+    else if targetPlatform.system == "powerpc64le-linux" then "${libc_lib}/lib/ld64.so.2"
     # ARM with a wildcard, which can be "" or "-armhf".
     else if (with targetPlatform; isAarch32 && isLinux)   then "${libc_lib}/lib/ld-linux*.so.3"
     else if targetPlatform.system == "aarch64-linux"  then "${libc_lib}/lib/ld-linux-aarch64.so.1"
diff --git a/pkgs/development/compilers/llvm/rocm/clang.nix b/pkgs/development/compilers/llvm/rocm/clang.nix
index 789d4c055eb..6ab0f894ca9 100644
--- a/pkgs/development/compilers/llvm/rocm/clang.nix
+++ b/pkgs/development/compilers/llvm/rocm/clang.nix
@@ -56,6 +56,11 @@ stdenv.mkDerivation rec {
     echo "$VCSVersion" > lib/Basic/VCSVersion.inc
   '';
 
+  passthru = {
+    isClang = true;
+    inherit llvm;
+  };
+
   meta = with lib; {
     description = "ROCm fork of the clang C/C++/Objective-C/Objective-C++ LLVM compiler frontend";
     homepage = "https://llvm.org/";
diff --git a/pkgs/development/libraries/spglib/default.nix b/pkgs/development/libraries/spglib/default.nix
new file mode 100644
index 00000000000..f4667acd579
--- /dev/null
+++ b/pkgs/development/libraries/spglib/default.nix
@@ -0,0 +1,26 @@
+{ stdenv, lib, fetchFromGitHub, cmake } :
+
+stdenv.mkDerivation rec {
+  pname = "spglib";
+  version = "1.16.0";
+
+  src = fetchFromGitHub {
+    owner = "atztogo";
+    repo = "spglib";
+    rev = "v${version}";
+    sha256 = "1kzc956m1pnazhz52vspqridlw72wd8x5l3dsilpdxl491aa2nws";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  checkTarget = "check";
+  doCheck = true;
+
+  meta = with lib; {
+    description = "C library for finding and handling crystal symmetries";
+    homepage = "https://atztogo.github.io/spglib/";
+    license = licenses.bsd3;
+    maintainers = [ maintainers.markuskowa ];
+    platforms = platforms.linux;
+  };
+}
diff --git a/pkgs/development/tools/ocaml/opam/installer.nix b/pkgs/development/tools/ocaml/opam/installer.nix
new file mode 100644
index 00000000000..4501ddd63f0
--- /dev/null
+++ b/pkgs/development/tools/ocaml/opam/installer.nix
@@ -0,0 +1,17 @@
+{ lib, unzip, opam, ocamlPackages }:
+
+ocamlPackages.buildDunePackage {
+  pname = "opam-installer";
+
+  useDune2 = true;
+
+  inherit (opam) version src;
+  nativeBuildInputs = [ unzip ];
+
+  configureFlags = [ "--disable-checks" "--prefix=$out" ];
+  buildInputs = with ocamlPackages; [ opam-format cmdliner ];
+
+  meta = opam.meta // {
+    description = "Handle (un)installation from opam install files";
+  };
+}
diff --git a/pkgs/games/freeciv/default.nix b/pkgs/games/freeciv/default.nix
index de5f2751fd1..f9938eaca31 100644
--- a/pkgs/games/freeciv/default.nix
+++ b/pkgs/games/freeciv/default.nix
@@ -28,7 +28,8 @@ in stdenv.mkDerivation rec {
     done
   '';
 
-  nativeBuildInputs = [ autoreconfHook pkg-config ];
+  nativeBuildInputs = [ autoreconfHook pkg-config ]
+    ++ optional qtClient [ qt5.wrapQtAppsHook ];
 
   buildInputs = [ lua5_3 zlib bzip2 curl lzma gettext libiconv ]
     ++ optionals sdlClient [ SDL SDL_mixer SDL_image SDL_ttf SDL_gfx freetype fluidsynth ]
diff --git a/pkgs/os-specific/linux/erofs-utils/default.nix b/pkgs/os-specific/linux/erofs-utils/default.nix
index e1ff63bce77..73e50c5740b 100644
--- a/pkgs/os-specific/linux/erofs-utils/default.nix
+++ b/pkgs/os-specific/linux/erofs-utils/default.nix
@@ -2,14 +2,14 @@
 
 stdenv.mkDerivation rec {
   pname = "erofs-utils";
-  version = "1.2";
+  version = "1.2.1";
   outputs = [ "out" "man" ];
 
   src = fetchgit {
     url =
       "https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils.git";
     rev = "v" + version;
-    sha256 = "07hvijq2hsn3gg1kb8abrfk23n83j57yx8kyv4wqgwhhvd30myjc";
+    sha256 = "1vb4mxsb59g29x7l22cffsqa8x743sra4j5zbmx89hjwpwm9vvcg";
   };
 
   buildInputs = [ autoreconfHook pkg-config fuse libuuid lz4 ];
diff --git a/pkgs/stdenv/linux/make-bootstrap-tools.nix b/pkgs/stdenv/linux/make-bootstrap-tools.nix
index 25cde589a92..e4db92b7717 100644
--- a/pkgs/stdenv/linux/make-bootstrap-tools.nix
+++ b/pkgs/stdenv/linux/make-bootstrap-tools.nix
@@ -258,7 +258,7 @@ in with pkgs; rec {
       gcc --version
 
     '' + lib.optionalString (stdenv.hostPlatform.libc == "glibc") ''
-      ldlinux=$(echo ${bootstrapTools}/lib/ld-linux*.so.?)
+      ldlinux=$(echo ${bootstrapTools}/lib/${builtins.baseNameOf binutils.dynamicLinker})
       export CPP="cpp -idirafter ${bootstrapTools}/include-glibc -B${bootstrapTools}"
       export CC="gcc -idirafter ${bootstrapTools}/include-glibc -B${bootstrapTools} -Wl,-dynamic-linker,$ldlinux -Wl,-rpath,${bootstrapTools}/lib"
       export CXX="g++ -idirafter ${bootstrapTools}/include-glibc -B${bootstrapTools} -Wl,-dynamic-linker,$ldlinux -Wl,-rpath,${bootstrapTools}/lib"
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6fa7b4b201d..76bf49b63fa 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7869,6 +7869,8 @@ in
 
   soapui = callPackage ../applications/networking/soapui { };
 
+  spglib = callPackage ../development/libraries/spglib { };
+
   ssh-askpass-fullscreen = callPackage ../tools/networking/ssh-askpass-fullscreen { };
 
   sshguard = callPackage ../tools/security/sshguard {};
@@ -10567,6 +10569,8 @@ in
     inherit (ocaml-ng.ocamlPackages_4_05) ocaml;
   };
 
+  opam-installer = callPackage ../development/tools/ocaml/opam/installer.nix { };
+
   open-watcom-bin = callPackage ../development/compilers/open-watcom-bin { };
 
   pforth = callPackage ../development/compilers/pforth {};
@@ -19663,6 +19667,7 @@ in
   prototool = callPackage ../development/tools/prototool { };
 
   qemu_kvm = lowPrio (qemu.override { hostCpuOnly = true; });
+  qemu_full = lowPrio (qemu.override { smbdSupport = true; cephSupport = true; });
 
   # See `xenPackages` source for explanations.
   # Building with `xen` instead of `xen-slim` is possible, but makes no sense.