diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9ca1621b4a4..a5870b45282 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -175,6 +175,16 @@ advanced_option(
     "Build using system unordered dense"
     OFF
 )
+advanced_option(
+    SLANG_USE_SYSTEM_SPIRV_TOOLS
+    "Build using system SPIR-V tools library"
+    OFF
+)
+advanced_option(
+    SLANG_USE_SYSTEM_GLSLANG
+    "Build using system glslang library"
+    OFF
+)
 
 option(
     SLANG_SPIRV_HEADERS_INCLUDE_DIR
@@ -408,6 +418,29 @@ if(SLANG_USE_SYSTEM_SPIRV_HEADERS)
     find_package(SPIRV-Headers REQUIRED)
 endif()
 
+if(${SLANG_USE_SYSTEM_MINIZ})
+    find_package(miniz REQUIRED)
+    add_library(miniz ALIAS miniz::miniz)
+endif()
+
+if(${SLANG_USE_SYSTEM_LZ4})
+    find_package(lz4 REQUIRED)
+    add_library(lz4_static ALIAS LZ4::lz4)
+endif()
+
+if(${SLANG_USE_SYSTEM_VULKAN_HEADERS})
+    find_package(VulkanHeaders REQUIRED)
+endif()
+
+if(${SLANG_USE_SYSTEM_SPIRV_TOOLS})
+    find_package(SPIRV-Tools REQUIRED)
+endif()
+
+if(${SLANG_USE_SYSTEM_GLSLANG})
+    find_package(glslang REQUIRED)
+    add_library(glslang ALIAS glslang::glslang)
+endif()
+
 add_subdirectory(external)
 
 # webgpu_dawn is only available as a fetched shared library, since Dawn's nested source
diff --git a/external/CMakeLists.txt b/external/CMakeLists.txt
index d8b4c2bcabc..faa8a5730c9 100644
--- a/external/CMakeLists.txt
+++ b/external/CMakeLists.txt
@@ -142,35 +142,40 @@ if(SLANG_ENABLE_SLANG_GLSLANG)
         )
     endif()
 
-    # SPIRV-Tools
-    set(SPIRV_TOOLS_BUILD_STATIC ON)
-    set(SPIRV_WERROR OFF)
-    set(SPIRV_SKIP_TESTS ON)
-    # Tools
-    if(NOT SLANG_OVERRIDE_SPIRV_TOOLS_PATH)
-        add_subdirectory(spirv-tools EXCLUDE_FROM_ALL ${system})
-    else()
-        add_subdirectory(
-            ${SLANG_OVERRIDE_SPIRV_TOOLS_PATH}/spirv-tools
-            spirv-tools
-            EXCLUDE_FROM_ALL
-            ${system}
-        )
+    if(NOT ${SLANG_USE_SYSTEM_SPIRV_TOOLS})
+        # SPIRV-Tools
+        set(SPIRV_TOOLS_BUILD_STATIC ON)
+        set(SPIRV_WERROR OFF)
+        set(SPIRV_SKIP_TESTS ON)
+        # Tools
+        if(NOT SLANG_OVERRIDE_SPIRV_TOOLS_PATH)
+            add_subdirectory(spirv-tools EXCLUDE_FROM_ALL ${system})
+        else()
+            add_subdirectory(
+                ${SLANG_OVERRIDE_SPIRV_TOOLS_PATH}/spirv-tools
+                spirv-tools
+                EXCLUDE_FROM_ALL
+                ${system}
+            )
+        endif()
     endif()
 
-    # glslang
-    set(SKIP_GLSLANG_INSTALL ON)
-    set(ENABLE_OPT ON)
-    set(ENABLE_PCH OFF)
-    if(NOT SLANG_OVERRIDE_GLSLANG_PATH)
-        add_subdirectory(glslang EXCLUDE_FROM_ALL ${system})
-    else()
-        add_subdirectory(
-            ${SLANG_OVERRIDE_GLSLANG_PATH}/glslang
-            glslang
-            EXCLUDE_FROM_ALL
-            ${system}
-        )
+    if(NOT ${SLANG_USE_SYSTEM_GLSLANG})
+        # glslang
+        set(SKIP_GLSLANG_INSTALL ON)
+        set(ENABLE_OPT ON)
+        set(ENABLE_PCH OFF)
+        set(ALLOW_EXTERNAL_SPIRV_TOOLS ${SLANG_USE_SYSTEM_SPIRV_TOOLS})
+        if(NOT SLANG_OVERRIDE_GLSLANG_PATH)
+            add_subdirectory(glslang EXCLUDE_FROM_ALL ${system})
+        else()
+            add_subdirectory(
+                ${SLANG_OVERRIDE_GLSLANG_PATH}/glslang
+                glslang
+                EXCLUDE_FROM_ALL
+                ${system}
+            )
+        endif()
     endif()
 endif()