diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2aa6642..e74f93c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,7 +56,7 @@ IF(ASSIMP_HUNTER_ENABLED)
   add_definitions(-DASSIMP_USE_HUNTER)
 ENDIF()
 
-PROJECT(Assimp VERSION 5.2.0)
+PROJECT(Assimp VERSION 5.2.4)
 
 # All supported options ###############################################
 
@@ -273,18 +273,18 @@ IF ((CMAKE_C_COMPILER_ID MATCHES "GNU") AND NOT MINGW)
 ELSEIF(MSVC)
   # enable multi-core compilation with MSVC
   IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang" ) # clang-cl
-    ADD_COMPILE_OPTIONS(/bigobj /W4 /WX )
+    ADD_COMPILE_OPTIONS(/bigobj)
   ELSE() # msvc
-    ADD_COMPILE_OPTIONS(/MP /bigobj /W4 /WX)
+    ADD_COMPILE_OPTIONS(/MP /bigobj)
   ENDIF()
   # disable "elements of array '' will be default initialized" warning on MSVC2013
   IF(MSVC12)
     ADD_COMPILE_OPTIONS(/wd4351)	
   ENDIF()
   ADD_COMPILE_OPTIONS(/wd4244) #supress warning for double to float conversion if Double precission is activated
-  SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /D_DEBUG /Zi /Od")
-  SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi")
-  SET(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /DEBUG:FULL /PDBALTPATH:%_PDB% /OPT:REF /OPT:ICF")
+  #SET(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} /D_DEBUG /Zi /Od")
+  #SET(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS_RELEASE} /Zi")
+  #SET(CMAKE_SHARED_LINKER_FLAGS_RELEASE "${CMAKE_SHARED_LINKER_FLAGS_RELEASE} /DEBUG:FULL /PDBALTPATH:%_PDB% /OPT:REF /OPT:ICF")
 ELSEIF (CMAKE_CXX_COMPILER_ID MATCHES "Clang" )
   IF(NOT ASSIMP_HUNTER_ENABLED)
     SET(CMAKE_CXX_STANDARD 11)
@@ -414,7 +414,7 @@ ENDIF()
 
 set(GENERATED_DIR "${CMAKE_CURRENT_BINARY_DIR}/generated")
 
-IF(ASSIMP_HUNTER_ENABLED)
+IF(0)
   set(CONFIG_INSTALL_DIR "lib/cmake/${PROJECT_NAME}")
   set(CMAKE_CONFIG_TEMPLATE_FILE "cmake-modules/assimp-hunter-config.cmake.in")
   set(NAMESPACE "${PROJECT_NAME}::")
@@ -422,7 +422,7 @@ IF(ASSIMP_HUNTER_ENABLED)
   set(VERSION_CONFIG "${GENERATED_DIR}/${PROJECT_NAME}ConfigVersion.cmake")
   set(PROJECT_CONFIG "${GENERATED_DIR}/${PROJECT_NAME}Config.cmake")
 ELSE()
-  set(CONFIG_INSTALL_DIR "${ASSIMP_LIB_INSTALL_DIR}/cmake/assimp-${ASSIMP_VERSION_MAJOR}.${ASSIMP_VERSION_MINOR}")
+  set(CONFIG_INSTALL_DIR "${ASSIMP_LIB_INSTALL_DIR}/cmake/assimp")
   set(CMAKE_CONFIG_TEMPLATE_FILE "cmake-modules/assimp-plain-config.cmake.in")
   string(TOLOWER ${PROJECT_NAME} PROJECT_NAME_LOWERCASE)
   set(NAMESPACE "${PROJECT_NAME_LOWERCASE}::")
@@ -464,14 +464,14 @@ ENDIF()
 
 # Search for external dependencies, and build them from source if not found
 # Search for zlib
-IF(ASSIMP_HUNTER_ENABLED)
-  hunter_add_package(ZLIB)
-  find_package(ZLIB CONFIG REQUIRED)
+IF(1)
+  #hunter_add_package(ZLIB)
+  find_package(ZLIB REQUIRED)
 
   add_definitions(-DASSIMP_BUILD_NO_OWN_ZLIB)
   set(ZLIB_FOUND TRUE)
-  set(ZLIB_LIBRARIES ZLIB::zlib)
-  set(ASSIMP_BUILD_MINIZIP TRUE)
+  set(ZLIB_LIBRARIES ZLIB::ZLIB)
+  set(ASSIMP_BUILD_MINIZIP OFF)
 ELSE()
   # If the zlib is already found outside, add an export in case assimpTargets can't find it.
   IF( ZLIB_FOUND )
@@ -512,12 +512,12 @@ ELSE()
 ENDIF()
 
 IF( NOT IOS )
-  IF( NOT ASSIMP_BUILD_MINIZIP )
+  IF( 0 )
     use_pkgconfig(UNZIP minizip)
   ENDIF()
 ELSE ()
   IF( NOT BUILD_SHARED_LIBS )
-    IF( NOT ASSIMP_BUILD_MINIZIP )
+    IF( 0 )
       use_pkgconfig(UNZIP minizip)
     ENDIF()
   ENDIF ()
diff --git a/cmake-modules/assimp-plain-config.cmake.in b/cmake-modules/assimp-plain-config.cmake.in
index 6551dcb..0796448 100644
--- a/cmake-modules/assimp-plain-config.cmake.in
+++ b/cmake-modules/assimp-plain-config.cmake.in
@@ -1,5 +1,20 @@
 @PACKAGE_INIT@
 
+include(CMakeFindDependencyMacro)
+
+find_dependency(pugixml CONFIG)
+if(NOT @BUILD_SHARED_LIBS@)
+    find_dependency(kubazip CONFIG)
+    find_dependency(minizip CONFIG)
+    #find_dependency(openddlparser CONFIG)
+    find_dependency(poly2tri CONFIG)
+    #find_dependency(polyclipping  CONFIG)
+    find_dependency(RapidJSON CONFIG)
+    find_dependency(Stb MODULE)
+    find_dependency(utf8cpp CONFIG)
+    find_dependency(ZLIB)
+endif()
+
 include("${CMAKE_CURRENT_LIST_DIR}/@TARGETS_EXPORT_NAME@.cmake")
 
 set(ASSIMP_ROOT_DIR ${PACKAGE_PREFIX_DIR})
diff --git a/code/AssetLib/3MF/D3MFExporter.cpp b/code/AssetLib/3MF/D3MFExporter.cpp
index 42cd991..640e2fb 100644
--- a/code/AssetLib/3MF/D3MFExporter.cpp
+++ b/code/AssetLib/3MF/D3MFExporter.cpp
@@ -57,7 +57,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef ASSIMP_USE_HUNTER
 #include <zip/zip.h>
 #else
-#include <contrib/zip/src/zip.h>
+#include <zip/zip.h>
 #endif
 
 namespace Assimp {
diff --git a/code/AssetLib/Blender/BlenderTessellator.h b/code/AssetLib/Blender/BlenderTessellator.h
index 0d0ba32..c3703c4 100644
--- a/code/AssetLib/Blender/BlenderTessellator.h
+++ b/code/AssetLib/Blender/BlenderTessellator.h
@@ -147,7 +147,7 @@ namespace Assimp
 #ifdef ASSIMP_USE_HUNTER
 #  include <poly2tri/poly2tri.h>
 #else
-#  include "../contrib/poly2tri/poly2tri/poly2tri.h"
+#  include <poly2tri/poly2tri.h>
 #endif
 
 namespace Assimp
diff --git a/code/AssetLib/IFC/IFCGeometry.cpp b/code/AssetLib/IFC/IFCGeometry.cpp
index ef59542..17e00cd 100644
--- a/code/AssetLib/IFC/IFCGeometry.cpp
+++ b/code/AssetLib/IFC/IFCGeometry.cpp
@@ -53,7 +53,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #  include <poly2tri/poly2tri.h>
 #  include <polyclipping/clipper.hpp>
 #else
-#  include "../contrib/poly2tri/poly2tri/poly2tri.h"
+#  include <poly2tri/poly2tri.h>
 #  include "../contrib/clipper/clipper.hpp"
 #endif
 
diff --git a/code/AssetLib/IFC/IFCLoader.cpp b/code/AssetLib/IFC/IFCLoader.cpp
index 0c20686..e6b20a3 100644
--- a/code/AssetLib/IFC/IFCLoader.cpp
+++ b/code/AssetLib/IFC/IFCLoader.cpp
@@ -54,7 +54,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef ASSIMP_USE_HUNTER
 #include <minizip/unzip.h>
 #else
-#include <unzip.h>
+#include <minizip/unzip.h>
 #endif
 #endif
 
diff --git a/code/AssetLib/IFC/IFCOpenings.cpp b/code/AssetLib/IFC/IFCOpenings.cpp
index 3c4a0b3..3fab616 100644
--- a/code/AssetLib/IFC/IFCOpenings.cpp
+++ b/code/AssetLib/IFC/IFCOpenings.cpp
@@ -53,7 +53,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #  include <poly2tri/poly2tri.h>
 #  include <polyclipping/clipper.hpp>
 #else
-#  include "../contrib/poly2tri/poly2tri/poly2tri.h"
+#  include <poly2tri/poly2tri.h>
 #  include "../contrib/clipper/clipper.hpp"
 #endif
 
diff --git a/code/AssetLib/MMD/MMDPmxParser.cpp b/code/AssetLib/MMD/MMDPmxParser.cpp
index ca37ba1..2ce7bdd 100644
--- a/code/AssetLib/MMD/MMDPmxParser.cpp
+++ b/code/AssetLib/MMD/MMDPmxParser.cpp
@@ -45,7 +45,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef ASSIMP_USE_HUNTER
 #  include <utf8.h>
 #else
-#  include "../contrib/utf8cpp/source/utf8.h"
+#  include <utf8.h>
 #endif
 #include <assimp/Exceptional.h>
 
diff --git a/code/AssetLib/SIB/SIBImporter.cpp b/code/AssetLib/SIB/SIBImporter.cpp
index 7b66afa..5adbe1d 100644
--- a/code/AssetLib/SIB/SIBImporter.cpp
+++ b/code/AssetLib/SIB/SIBImporter.cpp
@@ -59,7 +59,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef ASSIMP_USE_HUNTER
 #include <utf8.h>
 #else
-#include "../contrib/utf8cpp/source/utf8.h"
+#include <utf8.h>
 #endif
 #include <assimp/importerdesc.h>
 #include <assimp/scene.h>
diff --git a/code/AssetLib/STEPParser/STEPFileEncoding.cpp b/code/AssetLib/STEPParser/STEPFileEncoding.cpp
index d4456e6..812f29b 100644
--- a/code/AssetLib/STEPParser/STEPFileEncoding.cpp
+++ b/code/AssetLib/STEPParser/STEPFileEncoding.cpp
@@ -48,7 +48,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef ASSIMP_USE_HUNTER
 #  include <utf8.h>
 #else
-#  include <contrib/utf8cpp/source/utf8.h>
+#  include <utf8.h>
 #endif
 
 #include <memory>
diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index 5339454..45e07c0 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -897,8 +897,8 @@ SET( Extra_SRCS
 SOURCE_GROUP( Extra FILES ${Extra_SRCS})
 
 # pugixml
-IF(ASSIMP_HUNTER_ENABLED)
-  hunter_add_package(pugixml)
+IF(1)
+  #hunter_add_package(pugixml)
   find_package(pugixml CONFIG REQUIRED)
 ELSE()
   SET( Pugixml_SRCS
@@ -910,15 +910,15 @@ ELSE()
 ENDIF()
 
 # utf8
-IF(ASSIMP_HUNTER_ENABLED)
-  hunter_add_package(utf8)
+IF(1)
+  #hunter_add_package(utf8)
   find_package(utf8cpp CONFIG REQUIRED)
 ELSE()
   # utf8 is header-only, so Assimp doesn't need to do anything.
 ENDIF()
 
 # polyclipping
-IF(ASSIMP_HUNTER_ENABLED)
+IF(0)
   hunter_add_package(polyclipping)
   find_package(polyclipping CONFIG REQUIRED)
 ELSE()
@@ -930,8 +930,8 @@ ELSE()
 ENDIF()
 
 # poly2tri
-IF(ASSIMP_HUNTER_ENABLED)
-  hunter_add_package(poly2tri)
+IF(1)
+  #hunter_add_package(poly2tri)
   find_package(poly2tri CONFIG REQUIRED)
 ELSE()
   SET( Poly2Tri_SRCS
@@ -951,8 +951,8 @@ ELSE()
 ENDIF()
 
 # minizip/unzip
-IF(ASSIMP_HUNTER_ENABLED)
-  hunter_add_package(minizip)
+IF(1)
+  #hunter_add_package(minizip)
   find_package(minizip CONFIG REQUIRED)
 ELSE()
   SET( unzip_SRCS
@@ -969,9 +969,9 @@ ENDIF()
 # zip (https://github.com/kuba--/zip)
 separate_arguments(ASSIMP_EXPORTERS_LIST UNIX_COMMAND ${ASSIMP_EXPORTERS_ENABLED})
 IF(3MF IN_LIST ASSIMP_EXPORTERS_LIST)
-  IF(ASSIMP_HUNTER_ENABLED)
-    hunter_add_package(zip)
-    find_package(zip CONFIG REQUIRED)
+  IF(1)
+    #hunter_add_package(zip)
+    find_package(kubazip CONFIG REQUIRED)
   ELSE()
     SET( ziplib_SRCS
       ../contrib/zip/src/miniz.h
@@ -991,7 +991,7 @@ IF(3MF IN_LIST ASSIMP_EXPORTERS_LIST)
 ENDIF()
 
 # openddlparser
-IF(ASSIMP_HUNTER_ENABLED)
+IF(0)
   hunter_add_package(openddlparser)
   find_package(openddlparser CONFIG REQUIRED)
 ELSE()
@@ -1014,7 +1014,7 @@ ELSE()
 ENDIF()
 
 # Open3DGC
-IF(ASSIMP_HUNTER_ENABLED)
+IF(0)
   # Nothing to do, not available in Hunter yet.
 ELSE()
   SET ( open3dgc_SRCS
@@ -1049,6 +1049,7 @@ ELSE()
     ../contrib/Open3DGC/o3dgcVector.inl
   )
   SOURCE_GROUP( Contrib\\open3dgc FILES ${open3dgc_SRCS})
+  INCLUDE_DIRECTORIES("../contrib")
 ENDIF()
 
 # Check dependencies for glTF importer with Open3DGC-compression.
@@ -1057,7 +1058,7 @@ ENDIF()
 IF (NOT WIN32)
   FIND_PACKAGE(RT QUIET)
 ENDIF ()
-IF (NOT ASSIMP_HUNTER_ENABLED AND (RT_FOUND OR WIN32))
+IF (1)
   SET( ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC 1 )
   ADD_DEFINITIONS( -DASSIMP_IMPORTER_GLTF_USE_OPEN3DGC=1 )
 ELSE ()
@@ -1067,9 +1068,10 @@ ELSE ()
 ENDIF ()
 
 # RapidJSON
-IF(ASSIMP_HUNTER_ENABLED)
-  hunter_add_package(RapidJSON)
+IF(1)
+  #hunter_add_package(RapidJSON)
   find_package(RapidJSON CONFIG REQUIRED)
+  ADD_DEFINITIONS( -DRAPIDJSON_HAS_STDSTRING=1)
 ELSE()
   INCLUDE_DIRECTORIES("../contrib/rapidjson/include")
   ADD_DEFINITIONS( -DRAPIDJSON_HAS_STDSTRING=1)
@@ -1080,9 +1082,9 @@ ELSE()
 ENDIF()
 
 # stb
-IF(ASSIMP_HUNTER_ENABLED)
-  hunter_add_package(stb)
-  find_package(stb CONFIG REQUIRED)
+IF(1)
+  #hunter_add_package(stb)
+  find_package(Stb REQUIRED)
 ELSE()
   SET( stb_SRCS
     ../contrib/stb/stb_image.h
@@ -1106,7 +1108,7 @@ IF( MSVC OR "${CMAKE_CXX_SIMULATE_ID}" MATCHES "MSVC") # clang with MSVC ABI
   ADD_DEFINITIONS( -D_CRT_SECURE_NO_WARNINGS )
 endif ()
 
-IF(NOT ASSIMP_HUNTER_ENABLED)
+IF(0)
   if (UNZIP_FOUND)
     SET (unzip_compile_SRCS "")
   else ()
@@ -1157,7 +1159,7 @@ SET( assimp_src
 )
 ADD_DEFINITIONS( -DOPENDDLPARSER_BUILD )
 
-IF(NOT ASSIMP_HUNTER_ENABLED)
+IF(1)
   INCLUDE_DIRECTORIES(
       ${IRRXML_INCLUDE_DIR}
       ../contrib/openddlparser/include
@@ -1195,45 +1197,48 @@ TARGET_INCLUDE_DIRECTORIES ( assimp PUBLIC
   $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/../include>
   $<BUILD_INTERFACE:${CMAKE_CURRENT_BINARY_DIR}/../include>
   $<INSTALL_INTERFACE:${ASSIMP_INCLUDE_INSTALL_DIR}>
+  PRIVATE
+    ${Stb_INCLUDE_DIR}
 )
 
-IF(ASSIMP_HUNTER_ENABLED)
+IF(1)
   TARGET_LINK_LIBRARIES(assimp
-      PUBLIC
-      polyclipping::polyclipping
-      openddlparser::openddl_parser
+      PRIVATE
+      #polyclipping::polyclipping
+      #openddlparser::openddl_parser
+      ${OPENDDL_PARSER_LIBRARIES}
       poly2tri::poly2tri
       minizip::minizip
-      ZLIB::zlib
-      RapidJSON::rapidjson
+      ZLIB::ZLIB
+      rapidjson
       utf8cpp
+      PUBLIC
       pugixml
-      stb::stb
   )
-  if(TARGET zip::zip)
-    target_link_libraries(assimp PUBLIC zip::zip)
+  if(1)
+    target_link_libraries(assimp PRIVATE kubazip::kubazip)
   endif()
 
   if (ASSIMP_BUILD_DRACO)
-    target_link_libraries(assimp PUBLIC ${draco_LIBRARIES})
+    target_link_libraries(assimp PRIVATE ${draco_LIBRARIES})
   endif()
 ELSE()
-  TARGET_LINK_LIBRARIES(assimp ${ZLIB_LIBRARIES} ${OPENDDL_PARSER_LIBRARIES})
+  TARGET_LINK_LIBRARIES(assimp PRIVATE ${ZLIB_LIBRARIES} ${OPENDDL_PARSER_LIBRARIES})
   if (ASSIMP_BUILD_DRACO)
-    target_link_libraries(assimp ${draco_LIBRARIES})
+    target_link_libraries(assimp PRIVATE ${draco_LIBRARIES})
   endif()
 ENDIF()
 
 if(ASSIMP_ANDROID_JNIIOSYSTEM)
   set(ASSIMP_ANDROID_JNIIOSYSTEM_PATH port/AndroidJNI)
   add_subdirectory(../${ASSIMP_ANDROID_JNIIOSYSTEM_PATH}/ ../${ASSIMP_ANDROID_JNIIOSYSTEM_PATH}/)
-  target_link_libraries(assimp android_jniiosystem)
+  target_link_libraries(assimp PRIVATE android_jniiosystem)
 endif()
 
 IF (ASSIMP_BUILD_NONFREE_C4D_IMPORTER)
-  TARGET_LINK_LIBRARIES(assimp optimized ${C4D_RELEASE_LIBRARIES})
-  TARGET_LINK_LIBRARIES(assimp debug ${C4D_DEBUG_LIBRARIES})
-  TARGET_LINK_LIBRARIES(assimp ${C4D_EXTRA_LIBRARIES})
+  TARGET_LINK_LIBRARIES(assimp PRIVATE optimized ${C4D_RELEASE_LIBRARIES})
+  TARGET_LINK_LIBRARIES(assimp PRIVATE debug ${C4D_DEBUG_LIBRARIES})
+  TARGET_LINK_LIBRARIES(assimp PRIVATE ${C4D_EXTRA_LIBRARIES})
 ENDIF ()
 
 if( MSVC )
@@ -1274,13 +1279,13 @@ if (MINGW)
     ARCHIVE_OUTPUT_NAME assimp
   )
   if (NOT BUILD_SHARED_LIBS)
-    TARGET_LINK_LIBRARIES ( assimp -static-libgcc -static-libstdc++ -Wl,-Bstatic -lstdc++ -lwinpthread ) # winpthread is for libminizip.
+    TARGET_LINK_LIBRARIES ( assimp PRIVATE -static-libgcc -static-libstdc++ -Wl,-Bstatic -lstdc++ -lwinpthread ) # winpthread is for libminizip.
   endif ()
 endif()
 
 if (${CMAKE_SYSTEM_NAME} MATCHES "WindowsStore")
     target_compile_definitions(assimp PUBLIC WindowsStore)
-    TARGET_LINK_LIBRARIES(assimp advapi32)
+    TARGET_LINK_LIBRARIES(assimp PRIVATE advapi32)
 endif()
 
 SET_TARGET_PROPERTIES( assimp PROPERTIES
@@ -1310,10 +1315,10 @@ ENDIF()
 
 # Build against external unzip, or add ../contrib/unzip so
 # assimp can #include "unzip.h"
-IF(NOT ASSIMP_HUNTER_ENABLED)
+IF(0)
   if (UNZIP_FOUND)
     INCLUDE_DIRECTORIES(${UNZIP_INCLUDE_DIRS})
-    TARGET_LINK_LIBRARIES(assimp ${UNZIP_LIBRARIES})
+    TARGET_LINK_LIBRARIES(assimp PRIVATE ${UNZIP_LIBRARIES})
   else ()
     INCLUDE_DIRECTORIES("../")
   endif ()
@@ -1321,7 +1326,7 @@ ENDIF()
 
 # Add RT-extension library for glTF importer with Open3DGC-compression.
 IF (RT_FOUND AND ASSIMP_IMPORTER_GLTF_USE_OPEN3DGC)
-  TARGET_LINK_LIBRARIES(assimp ${RT_LIBRARY})
+  TARGET_LINK_LIBRARIES(assimp PRIVATE ${RT_LIBRARY})
 ENDIF ()
 
 
diff --git a/code/Common/Assimp.cpp b/code/Common/Assimp.cpp
index 71e312c..fa7fc36 100644
--- a/code/Common/Assimp.cpp
+++ b/code/Common/Assimp.cpp
@@ -1290,7 +1290,7 @@ ASSIMP_API void aiQuaternionInterpolate(
 #   endif
 
 #   define STB_IMAGE_IMPLEMENTATION
-#   include "stb/stb_image.h"
+#   include <stb_image.h>
 
 #   if _MSC_VER
 #       pragma warning(pop)
diff --git a/code/Common/BaseImporter.cpp b/code/Common/BaseImporter.cpp
index 383300e..03fdd9a 100644
--- a/code/Common/BaseImporter.cpp
+++ b/code/Common/BaseImporter.cpp
@@ -332,7 +332,7 @@ std::string BaseImporter::GetExtension(const std::string &file) {
 #ifdef ASSIMP_USE_HUNTER
 #include <utf8.h>
 #else
-#include "../contrib/utf8cpp/source/utf8.h"
+#include <utf8.h>
 #endif
 
 // ------------------------------------------------------------------------------------------------
diff --git a/code/Common/ZipArchiveIOSystem.cpp b/code/Common/ZipArchiveIOSystem.cpp
index e0c9883..78b522a 100644
--- a/code/Common/ZipArchiveIOSystem.cpp
+++ b/code/Common/ZipArchiveIOSystem.cpp
@@ -54,7 +54,7 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #ifdef ASSIMP_USE_HUNTER
 #    include <minizip/unzip.h>
 #else
-#    include <unzip.h>
+#    include <minizip/unzip.h>
 #endif
 
 namespace Assimp {
@@ -196,7 +196,9 @@ zlib_filefunc_def IOSystem2Unzip::get(IOSystem *pIOHandler) {
     zlib_filefunc_def mapping;
 
     mapping.zopen_file = (open_file_func)open;
+#ifdef ZOPENDISK64
     mapping.zopendisk_file = (opendisk_file_func)opendisk;
+#endif
     mapping.zread_file = (read_file_func)read;
     mapping.zwrite_file = (write_file_func)write;
     mapping.ztell_file = (tell_file_func)tell;
diff --git a/code/Pbrt/PbrtExporter.cpp b/code/Pbrt/PbrtExporter.cpp
index 9590c49..e23b9b1 100644
--- a/code/Pbrt/PbrtExporter.cpp
+++ b/code/Pbrt/PbrtExporter.cpp
@@ -83,7 +83,7 @@ Other:
 #include <sstream>
 #include <string>
 
-#include "stb/stb_image.h"
+#include <stb_image.h>
 
 using namespace Assimp;