diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0fb57e013..8d7adb9b1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -31,6 +31,8 @@ if (NOT VCPKG_OVERLAY_PORTS)
     endif()
 endif()
 
+list(APPEND VCPKG_OVERLAY_PORTS "${CMAKE_CURRENT_SOURCE_DIR}/extern/vcpkg/ports")
+
 message(STATUS "VCPKG_OVERLAY_PORTS ${VCPKG_OVERLAY_PORTS}")
 
 if (NOT VCPKG_OVERLAY_TRIPLETS)
diff --git a/Cesium3DTiles/test/TestTileset.cpp b/Cesium3DTiles/test/TestTileset.cpp
index 1d84c3a85..534ed6fcd 100644
--- a/Cesium3DTiles/test/TestTileset.cpp
+++ b/Cesium3DTiles/test/TestTileset.cpp
@@ -2,6 +2,7 @@
 
 #include <doctest/doctest.h>
 
+#include <algorithm>
 #include <cstring>
 
 using namespace Cesium3DTiles;
diff --git a/cmake/ezvcpkg/ezvcpkg.cmake b/cmake/ezvcpkg/ezvcpkg.cmake
index a65482ecc..dcdf1b4aa 100644
--- a/cmake/ezvcpkg/ezvcpkg.cmake
+++ b/cmake/ezvcpkg/ezvcpkg.cmake
@@ -164,11 +164,21 @@ macro(EZVCPKG_BUILD)
     set(INSTALL_COMMAND "${EZVCPKG_EXE}" --vcpkg-root "${EZVCPKG_DIR}" install --triplet ${VCPKG_TRIPLET})
 
     if (DEFINED VCPKG_OVERLAY_PORTS)
-        set(INSTALL_COMMAND ${INSTALL_COMMAND} --overlay-ports "${VCPKG_OVERLAY_PORTS}")
+        if (CMAKE_HOST_WIN32)
+            set(ENV{VCPKG_OVERLAY_PORTS} "${VCPKG_OVERLAY_PORTS}")
+        else()
+            string(REPLACE ";" ":" VCPKG_OVERLAY_PORTS_POSIX "${VCPKG_OVERLAY_PORTS}")
+            set(ENV{VCPKG_OVERLAY_PORTS} "${VCPKG_OVERLAY_PORTS_POSIX}")
+        endif()
     endif()
 
     if (DEFINED VCPKG_OVERLAY_TRIPLETS)
-        set(INSTALL_COMMAND ${INSTALL_COMMAND} --overlay-triplets "${VCPKG_OVERLAY_TRIPLETS}")
+        if (CMAKE_HOST_WIN32)
+            set(ENV{VCPKG_OVERLAY_TRIPLETS} "${VCPKG_OVERLAY_TRIPLETS}")
+        else()
+            string(REPLACE ";" ":" VCPKG_OVERLAY_TRIPLETS_POSIX "${VCPKG_OVERLAY_TRIPLETS}")
+            set(ENV{VCPKG_OVERLAY_TRIPLETS} "${VCPKG_OVERLAY_TRIPLETS_POSIX}")
+        endif()
     endif()
 
     if (EZVCPKG_SERIALIZE)
diff --git a/extern/vcpkg/ports/ktx/0001-Use-vcpkg-zstd.patch b/extern/vcpkg/ports/ktx/0001-Use-vcpkg-zstd.patch
new file mode 100644
index 000000000..71a587bd6
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/0001-Use-vcpkg-zstd.patch
@@ -0,0 +1,122 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 9a56491..d7ca937 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -345,7 +345,6 @@ set(KTX_MAIN_SRC
+     lib/basisu/transcoder/basisu_transcoder.cpp
+     lib/basisu/transcoder/basisu_transcoder.h
+     lib/basisu/transcoder/basisu.h
+-    lib/basisu/zstd/zstd.c
+     lib/checkheader.c
+     lib/dfdutils/createdfd.c
+     lib/dfdutils/colourspaces.c
+@@ -532,7 +531,6 @@ macro(common_libktx_settings target enable_write library_type)
+         $<INSTALL_INTERFACE:lib/basisu/transcoder>
+ 
+         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/lib/basisu/zstd>
+-        $<INSTALL_INTERFACE:lib/basisu/zstd>
+ 
+         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/utils>
+         $<INSTALL_INTERFACE:utils>
+@@ -627,6 +625,11 @@ macro(common_libktx_settings target enable_write library_type)
+         target_compile_definitions(${target} PUBLIC KTX_FEATURE_KTX2)
+     endif()
+ 
++    # Use vcpkg zstd
++    find_package(zstd CONFIG REQUIRED)
++    set(ZSTD_LIBRARIES "$<IF:$<TARGET_EXISTS:zstd::libzstd_shared>,zstd::libzstd_shared,zstd::libzstd_static>")
++    target_link_libraries(${target} PRIVATE ${ZSTD_LIBRARIES})
++
+     if(WIN32)
+         if(MINGW)
+             # Check if the Threads package is provided; if using Mingw it MIGHT be
+diff --git a/cmake/KtxConfig.cmake b/cmake/KtxConfig.cmake
+index 6386ba2..537bf4f 100644
+--- a/cmake/KtxConfig.cmake
++++ b/cmake/KtxConfig.cmake
+@@ -1,7 +1,8 @@
+ # Copyright 2015-2020 The Khronos Group Inc.
+ # SPDX-License-Identifier: Apache-2.0
+ 
+-# include(CMakeFindDependencyMacro)
+-# find_dependency()
++include(CMakeFindDependencyMacro)
++find_dependency(Threads)
++find_dependency(zstd CONFIG)
+ 
+ include("${CMAKE_CURRENT_LIST_DIR}/KtxTargets.cmake")
+diff --git a/lib/basisu/CMakeLists.txt b/lib/basisu/CMakeLists.txt
+index 492233a..152ceb5 100644
+--- a/lib/basisu/CMakeLists.txt
++++ b/lib/basisu/CMakeLists.txt
+@@ -145,9 +145,6 @@ set(BASISU_SRC_LIST ${COMMON_SRC_LIST}
+ 	transcoder/basisu_transcoder.cpp
+ 	)
+ 
+-if (ZSTD)
+-	set(BASISU_SRC_LIST ${BASISU_SRC_LIST} zstd/zstd.c)
+-endif()
+ 
+ if (APPLE)
+    set(BIN_DIRECTORY "bin_osx")
+@@ -165,6 +162,10 @@ else()
+ 	target_compile_definitions(basisu PRIVATE BASISD_SUPPORT_KTX2_ZSTD=0)
+ endif()
+ 
++if(ZSTD_LIBRARIES)
++    target_link_libraries(basisu ${ZSTD_LIBRARIES})
++endif()
++
+ if (NOT MSVC)
+ 	# For Non-Windows builds, let cmake try and find the system OpenCL headers/libs for us.
+ 	if (OPENCL_FOUND)
+diff --git a/lib/basisu/webgl/encoder/CMakeLists.txt b/lib/basisu/webgl/encoder/CMakeLists.txt
+index 588d91b..a337b13 100644
+--- a/lib/basisu/webgl/encoder/CMakeLists.txt
++++ b/lib/basisu/webgl/encoder/CMakeLists.txt
+@@ -34,9 +34,6 @@ if (EMSCRIPTEN)
+   )
+ 
+   if (KTX2_ZSTANDARD)
+-  	set(SRC_LIST ${SRC_LIST}
+-		../../zstd/zstd.c
+-	)
+ 	set(ZSTD_DEFINITION BASISD_SUPPORT_KTX2_ZSTD=1)
+   else()
+   	set(ZSTD_DEFINITION BASISD_SUPPORT_KTX2_ZSTD=0)
+@@ -55,6 +52,10 @@ if (EMSCRIPTEN)
+   target_compile_options(basis_encoder.js PRIVATE -fno-strict-aliasing -O3)
+   
+   target_include_directories(basis_encoder.js PRIVATE ../../transcoder)
++  
++  if(ZSTD_LIBRARIES)
++      target_link_libraries(basis_encoder.js ${ZSTD_LIBRARIES})
++  endif()
+ 
+   set_target_properties(basis_encoder.js PROPERTIES
+       OUTPUT_NAME "basis_encoder"
+diff --git a/lib/basisu/webgl/transcoder/CMakeLists.txt b/lib/basisu/webgl/transcoder/CMakeLists.txt
+index 372653d..5ebc3cf 100644
+--- a/lib/basisu/webgl/transcoder/CMakeLists.txt
++++ b/lib/basisu/webgl/transcoder/CMakeLists.txt
+@@ -28,9 +28,6 @@ if (EMSCRIPTEN)
+   endif()
+   
+   if (KTX2_ZSTANDARD)
+- 	set(SRC_LIST ${SRC_LIST}
+-		../../zstd/zstddeclib.c
+-	)
+ 	set(ZSTD_DEFINITION BASISD_SUPPORT_KTX2_ZSTD=1)
+   else()
+   	set(ZSTD_DEFINITION BASISD_SUPPORT_KTX2_ZSTD=0)
+@@ -44,6 +41,10 @@ if (EMSCRIPTEN)
+   target_compile_definitions(basis_transcoder.js PRIVATE NDEBUG BASISD_SUPPORT_UASTC=1 BASISD_SUPPORT_BC7=1 BASISD_SUPPORT_ATC=0 BASISD_SUPPORT_ASTC_HIGHER_OPAQUE_QUALITY=0 BASISD_SUPPORT_PVRTC2=0 BASISD_SUPPORT_FXT1=0 BASISD_SUPPORT_ETC2_EAC_RG11=0 BASISU_SUPPORT_ENCODING=0 ${KTX2_DEFINITION} ${ZSTD_DEFINITION} )
+   target_compile_options(basis_transcoder.js PRIVATE -O3 -fno-strict-aliasing)
+   target_include_directories(basis_transcoder.js PRIVATE ../../transcoder)
++  
++  if(ZSTD_LIBRARIES)
++      target_link_libraries(basis_transcoder.js ${ZSTD_LIBRARIES})
++  endif()
+ 
+   set_target_properties(basis_transcoder.js PROPERTIES
+       OUTPUT_NAME "basis_transcoder"
diff --git a/extern/vcpkg/ports/ktx/0002-Fix-versioning.patch b/extern/vcpkg/ports/ktx/0002-Fix-versioning.patch
new file mode 100644
index 000000000..1e5098806
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/0002-Fix-versioning.patch
@@ -0,0 +1,17 @@
+diff --git a/cmake/version.cmake b/cmake/version.cmake
+index 4094df1a..3b2af3bb 100644
+--- a/cmake/version.cmake
++++ b/cmake/version.cmake
+@@ -108,8 +108,10 @@ function(generate_version _var )
+     set(${_var} "${KTX_VERSION}" PARENT_SCOPE)
+ endfunction()
+ 
+-# Get latest tag
+-git_describe_raw(KTX_VERSION_FULL --abbrev=0 --match v[0-9]*)
++if (!KTX_VERSION_FULL)
++    # Get latest tag
++    git_describe_raw(KTX_VERSION_FULL --abbrev=0 --match v[0-9]*)
++endif()
+ #message("KTX full version: ${KTX_VERSION_FULL}")
+ 
+ # generate_version(TOKTX_VERSION tools/toktx)
diff --git a/extern/vcpkg/ports/ktx/0003-mkversion.patch b/extern/vcpkg/ports/ktx/0003-mkversion.patch
new file mode 100644
index 000000000..ee8b3c4af
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/0003-mkversion.patch
@@ -0,0 +1,13 @@
+diff --git a/cmake/version.cmake b/cmake/version.cmake
+index 9a90622..0fc3521 100644
+--- a/cmake/version.cmake
++++ b/cmake/version.cmake
+@@ -176,7 +176,7 @@ function( create_version_header dest_path target )
+         add_custom_command(
+             OUTPUT ${version_h_output}
+             # On Windows this command has to be invoked by a shell in order to work
+-            COMMAND ${BASH_EXECUTABLE} -c "\"./mkversion\" \"-o\" \"version.h\" \"${dest_path}\""
++            COMMAND "${BASH_EXECUTABLE}" -- ./mkversion -o version.h "${dest_path}"
+             WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}
+             COMMENT "Generate ${version_h_output}"
+             VERBATIM
diff --git a/extern/vcpkg/ports/ktx/0004-quirks.patch b/extern/vcpkg/ports/ktx/0004-quirks.patch
new file mode 100644
index 000000000..afc34236d
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/0004-quirks.patch
@@ -0,0 +1,21 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 1500844..810914e 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -263,7 +263,7 @@ if(MSVC)
+     # ";" argument separator is problematic. Can't use a GenEx `$<IF:`
+     # because `/W4;/WX` is returned as a single string.
+     add_compile_options( /W4;$<$<BOOL:${KTX_WERROR}>:/WX> )
+-    add_compile_options( $<IF:$<CONFIG:Debug>,/Gz,/O2> )
++    add_compile_options( $<IF:$<CONFIG:Debug>,,/O2> )
+     # Enable UTF-8 support
+     add_compile_options( $<$<C_COMPILER_ID:MSVC>:/utf-8> )
+     add_compile_options( $<$<CXX_COMPILER_ID:MSVC>:/utf-8> )
+@@ -946,6 +946,7 @@ if(EMSCRIPTEN)
+ endif()
+ 
+ add_library( objUtil STATIC
++    EXCLUDE_FROM_ALL
+     utils/argparser.cpp
+     utils/argparser.h
+     utils/ktxapp.h
diff --git a/extern/vcpkg/ports/ktx/0005-no-vendored-libs.patch b/extern/vcpkg/ports/ktx/0005-no-vendored-libs.patch
new file mode 100644
index 000000000..4c900225f
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/0005-no-vendored-libs.patch
@@ -0,0 +1,17 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e99fb143..0f69adf7 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1071,10 +1071,10 @@ endif()
+ if((KTX_FEATURE_TOOLS OR KTX_FEATURE_TESTS) AND NOT TARGET fmt::fmt)
+     set(FMT_INSTALL OFF)
+     set(FMT_SYSTEM_HEADERS ON)
+-    add_subdirectory(other_projects/fmt)
++    find_package(fmt CONFIG REQUIRED)
+ endif()
+ if(KTX_FEATURE_TOOLS AND NOT TARGET cxxopts::cxxopts)
+-    add_subdirectory(other_projects/cxxopts)
++    find_package(cxxopts CONFIG REQUIRED)
+ endif()
+ 
+ # Tools
diff --git a/extern/vcpkg/ports/ktx/0006-fix-ios-install.patch b/extern/vcpkg/ports/ktx/0006-fix-ios-install.patch
new file mode 100644
index 000000000..0af3fea68
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/0006-fix-ios-install.patch
@@ -0,0 +1,22 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index e99fb143..072ea889 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -489,7 +489,7 @@ macro(common_libktx_settings target enable_write library_type)
+         CXX_STANDARD_REQUIRED YES
+ 
+     )
+-    if(IOS)
++    if(0)
+         set_target_properties(${target} PROPERTIES
+             FRAMEWORK TRUE
+         )
+@@ -1145,7 +1145,7 @@ endif()
+ # Use of this to install KHR/khr_df.h is due to CMake's failure to
+ # preserve the include source folder hierarchy.
+ # See https://gitlab.kitware.com/cmake/cmake/-/issues/16739.
+-if (IOS)
++if (0)
+     set_source_files_properties(
+           include/KHR/khr_df.h
+           PROPERTIES MACOSX_PACKAGE_LOCATION Headers/KHR
diff --git a/extern/vcpkg/ports/ktx/portfile.cmake b/extern/vcpkg/ports/ktx/portfile.cmake
new file mode 100644
index 000000000..b5a5340fe
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/portfile.cmake
@@ -0,0 +1,81 @@
+vcpkg_from_git(
+    OUT_SOURCE_PATH SOURCE_PATH
+    URL "https://github.com/KhronosGroup/KTX-Software.git"
+    REF 91ace88675ac59a97e55d0378a6602a9ae6b98bd
+    FETCH_REF "v${VERSION}"
+    HEAD_REF main
+    PATCHES
+        0001-Use-vcpkg-zstd.patch
+        0002-Fix-versioning.patch
+        0003-mkversion.patch
+        0004-quirks.patch
+        0005-no-vendored-libs.patch
+        0006-fix-ios-install.patch
+)
+file(REMOVE "${SOURCE_PATH}/other_include/zstd_errors.h")
+
+vcpkg_list(SET OPTIONS)
+if(VCPKG_TARGET_IS_WINDOWS)
+    vcpkg_acquire_msys(MSYS_ROOT
+        PACKAGES
+            bash
+        DIRECT_PACKAGES
+            # Required for "getopt"
+            "https://repo.msys2.org/msys/x86_64/util-linux-2.35.2-3-x86_64.pkg.tar.zst"
+            da26540881cd5734072717133307e5d1a27a60468d3656885507833b80f24088c5382eaa0234b30bdd9e8484a6638b4514623f5327f10b19eed36f12158e8edb
+            # Required for "dos2unix"
+            "https://mirror.msys2.org/msys/x86_64/dos2unix-7.5.1-1-x86_64.pkg.tar.zst"
+            83d85e6ccea746ef9e8153a0d605e774dbe7efc0ee952804acfee4ffd7e3b0386a353b45ff989dd99bc3ce75968209fea3d246ad2af88bbb5c4eca12fc5a8f92
+    )
+    vcpkg_add_to_path("${MSYS_ROOT}/usr/bin")
+    vcpkg_list(APPEND OPTIONS "-DBASH_EXECUTABLE=${MSYS_ROOT}/usr/bin/bash.exe")
+endif()
+
+string(COMPARE EQUAL "${VCPKG_LIBRARY_LINKAGE}" "static" ENABLE_STATIC)
+
+vcpkg_check_features(OUT_FEATURE_OPTIONS FEATURE_OPTIONS
+    FEATURES
+        tools   KTX_FEATURE_TOOLS
+        vulkan  KTX_FEATURE_VK_UPLOAD
+)
+
+vcpkg_cmake_configure(
+    SOURCE_PATH "${SOURCE_PATH}"
+    OPTIONS
+        -DKTX_VERSION_FULL=v${VERSION}
+        -DKTX_FEATURE_TESTS=OFF
+        -DKTX_FEATURE_LOADTEST_APPS=OFF
+        -DKTX_FEATURE_STATIC_LIBRARY=${ENABLE_STATIC}
+        ${FEATURE_OPTIONS}
+        ${OPTIONS}
+    DISABLE_PARALLEL_CONFIGURE
+)
+
+vcpkg_cmake_install()
+
+if(tools IN_LIST FEATURES)
+    vcpkg_copy_tools(
+        TOOL_NAMES
+            ktx
+            toktx
+            ktxsc
+            ktxinfo
+            ktx2ktx2
+            ktx2check
+        AUTO_CLEAN
+    )
+else()
+    vcpkg_copy_pdbs()
+endif()
+
+vcpkg_cmake_config_fixup(CONFIG_PATH lib/cmake/ktx)
+
+file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/debug/include")
+
+if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
+    file(REMOVE_RECURSE "${CURRENT_PACKAGES_DIR}/bin" "${CURRENT_PACKAGES_DIR}/debug/bin")
+endif()
+
+file(GLOB LICENSE_FILES "${SOURCE_PATH}/LICENSES/*")
+file(COPY ${LICENSE_FILES} DESTINATION "${CURRENT_PACKAGES_DIR}/share/${PORT}/LICENSES")
+vcpkg_install_copyright(FILE_LIST "${SOURCE_PATH}/LICENSE.md")
diff --git a/extern/vcpkg/ports/ktx/vcpkg.json b/extern/vcpkg/ports/ktx/vcpkg.json
new file mode 100644
index 000000000..94eea841c
--- /dev/null
+++ b/extern/vcpkg/ports/ktx/vcpkg.json
@@ -0,0 +1,36 @@
+{
+  "name": "ktx",
+  "version-semver": "4.3.2",
+  "description": [
+    "The Khronos KTX library and tools.",
+    "Functions for writing and reading KTX files, and instantiating OpenGL®, OpenGL ES™️ and Vulkan® textures from them."
+  ],
+  "homepage": "https://github.com/KhronosGroup/KTX-Software",
+  "license": null,
+  "supports": "arm64 | x64 | !windows",
+  "dependencies": [
+    {
+      "name": "vcpkg-cmake",
+      "host": true
+    },
+    {
+      "name": "vcpkg-cmake-config",
+      "host": true
+    },
+    "zstd"
+  ],
+  "features": {
+    "tools": {
+      "description": "Build tools",
+      "supports": "!android & !uwp",
+      "dependencies": [
+        "cxxopts",
+        "fmt"
+      ]
+    },
+    "vulkan": {
+      "description": "Build Vulkan support",
+      "supports": "!emscripten"
+    }
+  }
+}