diff --git a/packages/l/libcroco/port/xmake.lua b/packages/l/libcroco/port/xmake.lua
new file mode 100644
index 000000000..c9adee8f3
--- /dev/null
+++ b/packages/l/libcroco/port/xmake.lua
@@ -0,0 +1,71 @@
+set_project("libcroco")
+add_rules("mode.debug", "mode.release")
+
+add_requires("glib", "libxml2")
+
+option("installprefix")
+    set_default("")
+    set_showmenu(true)
+option_end()
+if has_config("installprefix") then
+    local prefix = get_config("installprefix")
+    set_configvar("prefix", prefix)
+    set_configvar("CROCO_CFLAGS", "-I" .. prefix .. "/include")
+    set_configvar("CROCO_LIBS", "-L" .. prefix .. "/lib -lglib-2.0 -pthread -lm -lpcre -lxml2")
+end
+set_configvar("exec_prefix", "${prefix}")
+set_configvar("libdir", "${exec_prefix}/lib")
+set_configvar("includedir", "${prefix}/include")
+set_configvar("GLIB2_CFLAGS", "")
+set_configvar("GLIB2_LIBS", "")
+set_configvar("LIBXML2_CFLAGS", "")
+set_configvar("LIBXML2_LIBS", "")
+
+local mver = ""
+local major_ver = ""
+local minor_ver = ""
+option("vers")
+    set_default("")
+    set_showmenu(true)
+option_end()
+if has_config("vers") then
+    set_version(get_config("vers"))
+    set_configvar("VERSION", get_config("vers"))
+    set_configvar("LIBCROCO_VERSION", get_config("vers"))
+    set_configvar("LIBCROCO_VERSION_NUMBER", get_config("vers"))
+    local spvers = get_config("vers"):split("%.")
+    major_ver = spvers[1] or ""
+    minor_ver = spvers[2] or ""
+    mver = major_ver .. "." .. minor_ver
+    set_configvar("LIBCROCO_MAJOR_VERSION", major_ver)
+    set_configvar("LIBCROCO_MINOR_VERSION", minor_ver)
+end
+
+set_configvar("G_DISABLE_CHECKS", 0)
+
+target("croco")
+    set_basename("croco-" .. mver)
+    set_kind("$(kind)")
+    add_files("src/*.c")
+    add_includedirs("src", {public = true})
+    add_packages("glib", "libxml2", {public = true})
+    set_configdir("src")
+    add_configfiles("src/libcroco-config.h.in", {pattern = "@(.-)@"})
+    add_headerfiles("src/*.h", {prefixdir = "libcroco-" .. mver .. "/libcroco"})
+target_end()
+
+target("csslint")
+    set_basename("csslint-" .. mver)
+    set_kind("binary")
+    add_deps("croco")
+    add_files("csslint/csslint.c")
+    set_configdir(".")
+    if not is_plat("windows") then
+        add_configfiles("croco-config.in", {pattern = "@(.-)@"})
+        add_configfiles("libcroco.pc.in", {pattern = "@(.-)@"})
+        after_install(function (target)
+            os.cp("croco-config", path.join(target:installdir(), "bin", "croco-" .. mver .. "-config"))
+            os.cp("libcroco.pc", path.join(target:installdir(), "lib", "pkgconfig", "libcroco-" .. mver .. ".pc"))
+        end)
+    end
+target_end()
diff --git a/packages/l/libcroco/xmake.lua b/packages/l/libcroco/xmake.lua
new file mode 100644
index 000000000..7571b1167
--- /dev/null
+++ b/packages/l/libcroco/xmake.lua
@@ -0,0 +1,33 @@
+package("libcroco")
+
+    set_homepage("https://gitlab.com/inkscape/libcroco")
+    set_description("Libcroco is a standalone css2 parsing and manipulation library.")
+    set_license("LGPL-2.0")
+
+    add_urls("https://download.gnome.org/sources/libcroco/$(version).tar.xz", {version = function (version)
+        return format("%d.%d/libcroco-%s", version:major(), version:minor(), version)
+    end})
+    add_versions("0.6.13", "767ec234ae7aa684695b3a735548224888132e063f92db585759b422570621d4")
+
+    if is_plat("windows") then
+        add_configs("shared", {description = "Build shared library.", default = false, type = "boolean", readonly = true})
+    end
+
+    add_deps("glib", "libxml2")
+    on_load("windows", "macosx", "linux", function (package)
+        local ver = package:version()
+        package:add("includedirs", format("include/libcroco-%d.%d", ver:major(), ver:minor()))
+    end)
+
+    on_install("windows", "macosx", "linux", function (package)
+        os.cp(path.join(os.scriptdir(), "port", "xmake.lua"), "xmake.lua")
+        io.replace("src/cr-rgb.c", "#include \"config.h\"", "", {plain = true})
+        import("package.tools.xmake").install(package, {
+            installprefix = package:installdir():gsub("\\", "\\\\"),
+            vers = package:version_str()
+        })
+    end)
+
+    on_test(function (package)
+        assert(package:has_cfuncs("cr_utils_is_newline", {includes = "libcroco/libcroco.h"}))
+    end)
diff --git a/packages/l/lz4/xmake.lua b/packages/l/lz4/xmake.lua
index db0aaf83b..74b9120f9 100644
--- a/packages/l/lz4/xmake.lua
+++ b/packages/l/lz4/xmake.lua
@@ -7,8 +7,6 @@ package("lz4")
              "https://github.com/lz4/lz4.git")
     add_versions("v1.9.3", "030644df4611007ff7dc962d981f390361e6c97a34e5cbc393ddfbe019ffe2c1")
 
-    add_deps("xxhash")
-
     on_load("windows", function (package)
         if package:config("shared") then
             package:add("defines", "LZ4_DLL_IMPORT")
@@ -18,12 +16,11 @@ package("lz4")
     on_install(function (package)
         io.writefile("xmake.lua", [[
             add_rules("mode.debug", "mode.release")
-            add_requires("xxhash")
             target("lz4")
                 set_kind("$(kind)")
-                add_files("lib/*.c|xxhash.c")
+                add_files("lib/*.c")
                 add_headerfiles("lib/lz4.h", "lib/lz4hc.h", "lib/lz4frame.h")
-                add_packages("xxhash")
+                add_defines("XXH_NAMESPACE=LZ4_")
                 if is_kind("shared") and is_plat("windows") then
                     add_defines("LZ4_DLL_EXPORT")
                 end
diff --git a/packages/p/ptl/xmake.lua b/packages/p/ptl/xmake.lua
new file mode 100644
index 000000000..c42067ead
--- /dev/null
+++ b/packages/p/ptl/xmake.lua
@@ -0,0 +1,43 @@
+package("ptl")
+
+    set_homepage("https://github.com/jrmadsen/PTL")
+    set_description("Lightweight C++11 multithreading tasking system featuring thread-pool, task-groups, and lock-free task queue")
+    set_license("MIT")
+
+    add_urls("https://github.com/jrmadsen/PTL/archive/refs/tags/$(version).tar.gz",
+             "https://github.com/jrmadsen/PTL.git")
+    add_versions("v2.0.0", "58e561a3a1de75679faf4d8760d2ff045ced232d4367157b5b4e4f26c8474721")
+
+    add_configs("tbb", {description = "Enable TBB support.", default = false, type = "boolean"})
+
+    add_deps("cmake")
+    if is_plat("linux") then
+        add_syslinks("pthread")
+    end
+    on_load("windows", "macosx", "linux", function (package)
+        if package:config("tbb") then
+            package:add("deps", "tbb")
+        end
+    end)
+
+    on_install("windows", "macosx", "linux", function (package)
+        io.replace("cmake/Templates/PTLConfig.cmake.in", "if(WIN32)", "if(FALSE)", {plain = true})
+        local configs = {}
+        table.insert(configs, "-DCMAKE_BUILD_TYPE=" .. (package:debug() and "Debug" or "Release"))
+        table.insert(configs, "-DBUILD_SHARED_LIBS=" .. (package:config("shared") and "ON" or "OFF"))
+        table.insert(configs, "-DBUILD_STATIC_LIBS=" .. (package:config("shared") and "OFF" or "ON"))
+        table.insert(configs, "-DPTL_USE_TBB=" .. (package:config("tbb") and "ON" or "OFF"))
+        import("package.tools.cmake").install(package, configs)
+    end)
+
+    on_test(function (package)
+        assert(package:check_cxxsnippets({test = [[
+            #include <PTL/ThreadPool.hh>
+            #include <PTL/TaskGroup.hh>
+            void test() {
+                PTL::ThreadPool tp(4);
+                auto join = [](long& lhs, long rhs) { return lhs += rhs; };
+                PTL::TaskGroup<long> foo(join, &tp);
+            }
+        ]]}, {configs = {languages = "c++11"}}))
+    end)
diff --git a/packages/t/tbb/xmake.lua b/packages/t/tbb/xmake.lua
index f2436588c..6a57f6ff6 100644
--- a/packages/t/tbb/xmake.lua
+++ b/packages/t/tbb/xmake.lua
@@ -9,11 +9,13 @@ package("tbb")
         add_versions("2020.3", "cda37eed5209746a79c88a658f8c1bf3782f58bd9f9f6ba0da3a16624a9bfaa1")
         add_versions("2021.2.0", "9be37b1cb604a5905db0a15b2b893d85579fd0b2f1024859e1f75e96d7331a02")
         add_versions("2021.3.0", "90e2055cd4be55f79eedd3d50b2010bf05d1739309c4cdd219192d129e931093")
+        add_versions("2021.4.0", "3868c557739a7a5b74c985571648c066167fd7a0a8c63bdac00a6cfeeb58037f")
     else
         add_urls("https://github.com/oneapi-src/oneTBB/archive/v$(version).tar.gz")
         add_versions("2020.3", "ebc4f6aa47972daed1f7bf71d100ae5bf6931c2e3144cf299c8cc7d041dca2f3")
         add_versions("2021.2.0", "cee20b0a71d977416f3e3b4ec643ee4f38cedeb2a9ff015303431dd9d8d79854")
         add_versions("2021.3.0", "8f616561603695bbb83871875d2c6051ea28f8187dbe59299961369904d1d49e")
+        add_versions("2021.4.0", "021796c7845e155e616f5ecda16daa606ebb4c6f90b996e5c08aebab7a8d3de3")
 
         add_patches("2021.2.0", path.join(os.scriptdir(), "patches", "2021.2.0", "gcc11.patch"), "181511cf4878460cb48ac0531d3ce8d1c57626d698e9001a0951c728fab176fb")
 
diff --git a/packages/z/zstd/xmake.lua b/packages/z/zstd/xmake.lua
index 949997d4b..39121dd5a 100644
--- a/packages/z/zstd/xmake.lua
+++ b/packages/z/zstd/xmake.lua
@@ -8,28 +8,21 @@ package("zstd")
     add_versions("v1.4.5", "734d1f565c42f691f8420c8d06783ad818060fc390dee43ae0a89f86d0a4f8c2")
     add_versions("v1.5.0", "0d9ade222c64e912d6957b11c923e214e2e010a18f39bec102f572e693ba2867")
 
-    add_deps("xxhash")
-
     on_install(function (package)
         io.writefile("xmake.lua", [[
             add_rules("mode.debug", "mode.release")
-            add_requires("xxhash")
             target("zstd")
                 set_kind("$(kind)")
-                add_files("lib/common/*.c|xxhash.c")
+                add_files("lib/common/*.c")
                 add_files("lib/compress/*.c")
                 add_files("lib/decompress/*.c")
-                add_packages("xxhash")
                 add_headerfiles("lib/zstd.h")
+                add_defines("XXH_NAMESPACE=ZSTD_")
                 if is_kind("shared") and is_plat("windows") then
                     add_defines("ZSTD_DLL_EXPORT")
                 end
         ]])
-        local configs = {}
-        if package:config("shared") then
-            configs.kind = "shared"
-        end
-        import("package.tools.xmake").install(package, configs)
+        import("package.tools.xmake").install(package)
     end)
 
     on_test(function (package)