diff --git a/benchmarks/CMakeLists.txt b/benchmarks/CMakeLists.txt
index a72c9f6c..89c85a56 100644
--- a/benchmarks/CMakeLists.txt
+++ b/benchmarks/CMakeLists.txt
@@ -20,19 +20,18 @@ endif()
 
 add_library(bm_simd STATIC ${BENCHMARK_SIMD_SOURCES})
 target_link_libraries(bm_simd PRIVATE absl::span sfizz::cpuid)
-target_include_directories(bm_simd PRIVATE ../src/external)
 add_library(bm_ftz STATIC ../src/sfizz/ScopedFTZ.cpp)
 
 macro(sfizz_add_benchmark TARGET)
     add_executable("${TARGET}" ${ARGN})
     target_link_libraries("${TARGET}"
-        PRIVATE absl::span absl::algorithm
+        PRIVATE sfizz::filesystem absl::span absl::algorithm
         PRIVATE benchmark::benchmark benchmark::benchmark_main
         PRIVATE bm_simd bm_ftz)
     if(LIBATOMIC_FOUND)
         target_link_libraries("${TARGET}" PRIVATE atomic)
     endif()
-    target_include_directories("${TARGET}" PRIVATE ../src/sfizz ../src/external)
+    target_include_directories("${TARGET}" PRIVATE ../src/sfizz)
     sfizz_enable_fast_math("${TARGET}")
 endmacro()
 
@@ -75,7 +74,7 @@ target_link_libraries(bm_powerFollower PRIVATE sfizz::sfizz)
 
 if(TARGET sfizz::samplerate)
 sfizz_add_benchmark(bm_resample BM_resample.cpp ${BENCHMARK_SIMD_SOURCES})
-target_link_libraries(bm_resample PRIVATE sfizz::samplerate sfizz::sndfile sfizz::cpuid)
+target_link_libraries(bm_resample PRIVATE sfizz::samplerate sfizz::sndfile sfizz::cpuid sfizz::hiir)
 endif()
 
 sfizz_add_benchmark(bm_envelopes BM_envelopes.cpp)
@@ -95,7 +94,7 @@ sfizz_add_benchmark(bm_readChunkFlac BM_readChunkFlac.cpp)
 target_link_libraries(bm_readChunkFlac PRIVATE sfizz::sndfile)
 
 sfizz_add_benchmark(bm_resampleChunk BM_resampleChunk.cpp)
-target_link_libraries(bm_resampleChunk PRIVATE sfizz::sndfile)
+target_link_libraries(bm_resampleChunk PRIVATE sfizz::sndfile sfizz::hiir)
 
 sfizz_add_benchmark(bm_interpolators BM_interpolators.cpp)
 
diff --git a/common.mk b/common.mk
index 4f3289fa..cda6e2e4 100644
--- a/common.mk
+++ b/common.mk
@@ -126,7 +126,6 @@ SFIZZ_SOURCES = \
 ### Other internal
 
 SFIZZ_C_FLAGS += -I$(SFIZZ_DIR)/src/sfizz
-SFIZZ_C_FLAGS += -I$(SFIZZ_DIR)/src/external
 
 # Pkg-config dependency
 
@@ -175,6 +174,14 @@ SFIZZ_CXX_FLAGS += \
 	-I$(SFIZZ_DIR)/external/st_audiofile/thirdparty/libaiff
 endif
 
+# hiir dependency
+
+SFIZZ_CXX_FLAGS += -I$(SFIZZ_DIR)/src/external/hiir
+
+# ghc::filesystem dependency
+
+SFIZZ_CXX_FLAGS += -I$(SFIZZ_DIR)/external/filesystem/include
+
 ### Abseil dependency
 
 SFIZZ_C_FLAGS += -I$(SFIZZ_DIR)/external/abseil-cpp
diff --git a/demos/CMakeLists.txt b/demos/CMakeLists.txt
index ba349140..b2d715f8 100644
--- a/demos/CMakeLists.txt
+++ b/demos/CMakeLists.txt
@@ -37,10 +37,10 @@ if(TARGET Qt5::Widgets)
 endif()
 
 add_executable(eq_apply EQ.cpp)
-target_link_libraries(eq_apply PRIVATE sfizz::sfizz sfizz::sndfile sfizz::cxxopts)
+target_link_libraries(eq_apply PRIVATE sfizz::sfizz sfizz::sndfile sfizz::cxxopts sfizz::filesystem)
 
 add_executable(filter_apply Filter.cpp)
-target_link_libraries(filter_apply PRIVATE sfizz::sfizz sfizz::sndfile sfizz::cxxopts)
+target_link_libraries(filter_apply PRIVATE sfizz::sfizz sfizz::sndfile sfizz::cxxopts sfizz::filesystem)
 
 add_executable(sfizz_plot_curve PlotCurve.cpp)
 target_link_libraries(sfizz_plot_curve PRIVATE sfizz::sfizz)
diff --git a/editor/CMakeLists.txt b/editor/CMakeLists.txt
index 9517c51e..34405afb 100644
--- a/editor/CMakeLists.txt
+++ b/editor/CMakeLists.txt
@@ -69,7 +69,7 @@ else()
     target_include_directories(sfizz_editor PRIVATE ${sfizz-gio_INCLUDE_DIRS})
     target_link_libraries(sfizz_editor PRIVATE ${sfizz-gio_LIBRARIES})
 endif()
-target_include_directories(sfizz_editor PRIVATE "../src/external") # ghc::filesystem
+target_link_libraries(sfizz_editor PRIVATE sfizz::filesystem)
 
 # layout tool
 if(NOT CMAKE_CROSSCOMPILING)
diff --git a/scripts/run_clang_tidy.sh b/scripts/run_clang_tidy.sh
index 18d0b08f..7c2894aa 100755
--- a/scripts/run_clang_tidy.sh
+++ b/scripts/run_clang_tidy.sh
@@ -30,7 +30,7 @@ clang-tidy \
   vst/SfizzVstProcessor.cpp \
   vst/SfizzVstEditor.cpp \
   vst/SfizzVstState.cpp \
-  -- -Iexternal/abseil-cpp -Iexternal/jsl/include -Isrc/external -Isrc/external/pugixml/src \
+  -- -Iexternal/abseil-cpp -Iexternal/jsl/include -Iexternal/filesystem/include -Isrc/external/hiir -Isrc/external/pugixml/src \
      -Iexternal/st_audiofile/src -Iexternal/st_audiofile/thirdparty/dr_libs \
       -Isrc/sfizz -Isrc -Isrc/external/spline -Isrc/external/cpuid/src \
       -Ivst -Ivst/external/VST_SDK/VST3_SDK -Ivst/external/VST_SDK/VST3_SDK/vstgui4 -Ivst/external/ring_buffer \
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index ed93df85..a10b3aa7 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -214,11 +214,13 @@ source_group("Other Files" FILES ${SFIZZ_PARSER_OTHER})
 
 # Sfizz parser library
 add_library(sfizz_parser STATIC)
+add_library(sfizz::parser ALIAS sfizz_parser)
 target_sources(sfizz_parser PRIVATE
     ${SFIZZ_PARSER_HEADERS} ${SFIZZ_PARSER_SOURCES} ${SFIZZ_PARSER_OTHER})
 target_include_directories(sfizz_parser PUBLIC sfizz)
-target_include_directories(sfizz_parser PUBLIC external)
-target_link_libraries(sfizz_parser PUBLIC absl::strings PRIVATE absl::flat_hash_map)
+target_link_libraries(sfizz_parser
+    PUBLIC sfizz::filesystem absl::strings
+    PRIVATE absl::flat_hash_map)
 
 # OSC messaging library
 set(SFIZZ_MESSAGING_HEADERS
@@ -237,12 +239,13 @@ target_link_libraries(sfizz_messaging PUBLIC absl::strings)
 
 # Sfizz static library
 add_library(sfizz_static STATIC)
+add_library(sfizz::static ALIAS sfizz_static)
 target_sources(sfizz_static PRIVATE
     ${SFIZZ_HEADERS} ${SFIZZ_SOURCES} ${FAUST_FILES} sfizz/sfizz_wrapper.cpp sfizz/sfizz.cpp)
 target_include_directories(sfizz_static PUBLIC .)
 target_include_directories(sfizz_static PUBLIC external)
-target_link_libraries(sfizz_static PUBLIC absl::strings absl::span)
-target_link_libraries(sfizz_static PRIVATE sfizz_parser sfizz_messaging absl::flat_hash_map Threads::Threads st_audiofile sfizz::pugixml sfizz::spline sfizz::tunings sfizz::kissfft sfizz::cpuid sfizz::jsl sfizz::atomic)
+target_link_libraries(sfizz_static PUBLIC absl::strings absl::span sfizz::filesystem)
+target_link_libraries(sfizz_static PRIVATE sfizz_parser sfizz_messaging absl::flat_hash_map Threads::Threads st_audiofile sfizz::pugixml sfizz::spline sfizz::tunings sfizz::hiir sfizz::kissfft sfizz::cpuid sfizz::jsl sfizz::atomic)
 set_target_properties(sfizz_static PROPERTIES OUTPUT_NAME sfizz PUBLIC_HEADER "sfizz.h;sfizz.hpp;sfizz_message.h")
 if(SFIZZ_USE_SNDFILE)
     target_compile_definitions(sfizz_static PUBLIC SFIZZ_USE_SNDFILE=1)
@@ -263,17 +266,17 @@ endif()
 
 configure_file(${PROJECT_SOURCE_DIR}/scripts/doxygen/Doxyfile.in ${PROJECT_SOURCE_DIR}/Doxyfile @ONLY)
 
-add_library(sfizz::parser ALIAS sfizz_parser)
 add_library(sfizz::sfizz ALIAS sfizz_static)
 
 # Shared library and installation target
 if(SFIZZ_SHARED)
     add_library(sfizz_shared SHARED)
+    add_library(sfizz::shared ALIAS sfizz_shared)
     target_sources(sfizz_shared PRIVATE
         ${SFIZZ_HEADERS} ${SFIZZ_SOURCES} ${FAUST_FILES} sfizz/sfizz_wrapper.cpp sfizz/sfizz.cpp)
     target_include_directories(sfizz_shared PRIVATE .)
     target_include_directories(sfizz_shared PRIVATE external)
-    target_link_libraries(sfizz_shared PRIVATE absl::strings absl::span sfizz_parser sfizz_messaging absl::flat_hash_map Threads::Threads st_audiofile sfizz::pugixml sfizz::spline sfizz::tunings sfizz::kissfft sfizz::cpuid sfizz::jsl sfizz::atomic)
+    target_link_libraries(sfizz_shared PRIVATE absl::strings absl::span sfizz_parser sfizz_messaging absl::flat_hash_map Threads::Threads st_audiofile sfizz::pugixml sfizz::spline sfizz::tunings sfizz::hiir sfizz::kissfft sfizz::cpuid sfizz::jsl sfizz::filesystem sfizz::atomic)
     if(SFIZZ_USE_SNDFILE)
         target_compile_definitions(sfizz_shared PUBLIC SFIZZ_USE_SNDFILE=1)
         target_link_libraries(sfizz_shared PUBLIC st_audiofile)
diff --git a/vst/CMakeLists.txt b/vst/CMakeLists.txt
index 468b6f1f..2b215fc5 100644
--- a/vst/CMakeLists.txt
+++ b/vst/CMakeLists.txt
@@ -60,7 +60,7 @@ endif()
 target_link_libraries(${VSTPLUGIN_PRJ_NAME}
     PRIVATE ${PROJECT_NAME}::${PROJECT_NAME}
     PRIVATE sfizz_editor
-    PRIVATE sfizz::pugixml)
+    PRIVATE sfizz::pugixml sfizz::filesystem)
 target_include_directories(${VSTPLUGIN_PRJ_NAME}
     PRIVATE "${CMAKE_CURRENT_BINARY_DIR}")
 set_target_properties(${VSTPLUGIN_PRJ_NAME} PROPERTIES
@@ -198,7 +198,7 @@ elseif(SFIZZ_AU)
     target_link_libraries(${AUPLUGIN_PRJ_NAME}
         PRIVATE ${PROJECT_NAME}::${PROJECT_NAME}
         PRIVATE sfizz_editor
-        PRIVATE sfizz::pugixml)
+        PRIVATE sfizz::pugixml sfizz::filesystem)
     target_include_directories(${AUPLUGIN_PRJ_NAME}
         PRIVATE "${CMAKE_CURRENT_BINARY_DIR}")
     set_target_properties(${AUPLUGIN_PRJ_NAME} PROPERTIES