diff --git a/src/gpu.cpp b/src/gpu.cpp
index 00a711d09..8b28e53be 100644
--- a/src/gpu.cpp
+++ b/src/gpu.cpp
@@ -5762,4 +5762,24 @@ int resolve_shader_info(const uint32_t* spv_data, size_t spv_data_size, ShaderIn
 
 } // namespace ncnn
 
+#else
+
+namespace ncnn {
+
+int create_gpu_instance(const char* driver_path)
+{
+    return 0;
+}
+
+void destroy_gpu_instance()
+{
+}
+
+int get_gpu_count()
+{
+    return 0;
+}
+
+} // namespace ncnn
+
 #endif // NCNN_VULKAN
diff --git a/src/gpu.h b/src/gpu.h
index 7863b2e21..f11d8327f 100644
--- a/src/gpu.h
+++ b/src/gpu.h
@@ -551,6 +551,16 @@ public:
 
 NCNN_EXPORT int resolve_shader_info(const uint32_t* spv_data, size_t spv_data_size, ShaderInfo& shader_info);
 
+} // namespace ncnn
+#else
+namespace ncnn {
+
+NCNN_EXPORT int create_gpu_instance(const char* driver_path = 0);
+
+NCNN_EXPORT void destroy_gpu_instance(void);
+
+NCNN_EXPORT int get_gpu_count(void);
+
 } // namespace ncnn
 
 #endif // NCNN_VULKAN
diff --git a/src/net.cpp b/src/net.cpp
index c257a36d1..a08f69240 100644
--- a/src/net.cpp
+++ b/src/net.cpp
@@ -2173,6 +2173,13 @@ void Extractor::set_staging_vkallocator(VkAllocator* allocator)
 {
     d->opt.staging_vkallocator = allocator;
 }
+
+#else
+
+void Extractor::set_vulkan_compute(bool enable)
+{
+}
+
 #endif // NCNN_VULKAN
 
 #if NCNN_STRING
diff --git a/src/net.h b/src/net.h
index c7e33956a..217273070 100644
--- a/src/net.h
+++ b/src/net.h
@@ -191,6 +191,8 @@ public:
     void set_workspace_vkallocator(VkAllocator* allocator);
 
     void set_staging_vkallocator(VkAllocator* allocator);
+#else
+    void set_vulkan_compute(bool enable);
 #endif // NCNN_VULKAN
 
 #if NCNN_STRING