diff --git a/CMakeLists.txt b/CMakeLists.txt
index 13f22441..53751722 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -61,6 +61,12 @@ else()
     add_definitions(-DPK_ENABLE_THREADS=0)
 endif()
 
+if(PK_ENABLE_DLL)
+    add_definitions(-DPK_ENABLE_DLL=1)
+else()
+    add_definitions(-DPK_ENABLE_DLL=0)
+endif()
+
 if(PK_ENABLE_DETERMINISM)
     add_definitions(-DPK_ENABLE_DETERMINISM=1)
 else()
@@ -154,7 +160,7 @@ if(PK_ENABLE_THREADS)
 endif()
 
 if(UNIX AND NOT APPLE)
-    if(PK_ENABLE_OS)
+    if(PK_ENABLE_OS AND PK_ENABLE_DLL)
         target_link_libraries(${PROJECT_NAME} dl)
     endif()
 elseif(WIN32)
diff --git a/CMakeOptions.txt b/CMakeOptions.txt
index edd50f9d..573fcd7e 100644
--- a/CMakeOptions.txt
+++ b/CMakeOptions.txt
@@ -8,6 +8,7 @@ endif()
 # system features
 option(PK_ENABLE_OS "" ON)
 option(PK_ENABLE_THREADS "" ON)
+option(PK_ENABLE_DLL "" ON)
 option(PK_ENABLE_DETERMINISM "" ON)
 option(PK_ENABLE_WATCHDOG "" OFF)
 option(PK_ENABLE_CUSTOM_SNAME "" OFF)
diff --git a/include/pocketpy/config.h b/include/pocketpy/config.h
index 4ea9795e..2e219c77 100644
--- a/include/pocketpy/config.h
+++ b/include/pocketpy/config.h
@@ -1,18 +1,22 @@
 #pragma once
 // clang-format off
 
-#define PK_VERSION				"2.1.8"
+#define PK_VERSION				"2.1.9"
 #define PK_VERSION_MAJOR            2
 #define PK_VERSION_MINOR            1
-#define PK_VERSION_PATCH            8
+#define PK_VERSION_PATCH            9
 
 /*************** feature settings ***************/
 #ifndef PK_ENABLE_OS                // can be overridden by cmake
 #define PK_ENABLE_OS                1
 #endif
 
-#ifndef PK_ENABLE_THREADS           // can be overridden by cmake
-#define PK_ENABLE_THREADS           1
+#ifndef PK_ENABLE_THREADS           // must be enabled from cmake
+#define PK_ENABLE_THREADS           0
+#endif
+
+#ifndef PK_ENABLE_DLL               // must be enabled from cmake
+#define PK_ENABLE_DLL               0
 #endif
 
 #ifndef PK_ENABLE_DETERMINISM       // must be enabled from cmake
diff --git a/src/interpreter/dll.c b/src/interpreter/dll.c
index f45360e9..0f4bd6c1 100644
--- a/src/interpreter/dll.c
+++ b/src/interpreter/dll.c
@@ -1,6 +1,6 @@
 #include "pocketpy/pocketpy.h"
 
-#if PK_IS_DESKTOP_PLATFORM && PK_ENABLE_OS
+#if PK_IS_DESKTOP_PLATFORM && PK_ENABLE_OS && PK_ENABLE_DLL
 
 #ifdef _WIN32