diff --git a/CMakeLists.txt b/CMakeLists.txt
index e91d7c62..0852fa54 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -16,6 +16,12 @@ set(CMAKE_CXX_STANDARD_REQUIRED ON)
 set(CMAKE_CXX_EXTENSIONS OFF) #...without compiler extensions like gnu++11
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
 
+###### options ######
+option(AVA_GEN_TF_SPEC "Enable cuda spec used by tensorflow" OFF)
+option(AVA_GEN_ONNXRT_SPEC "Enable cuda spec used by onnxruntime" OFF)
+message(STATUS "ava gen tf spec" ${AVA_GEN_TF_SPEC})
+message("ava gen onnxrt spec true" ${AVA_GEN_ONNXRT_SPEC})
+
 # Always include debug info
 add_compile_options("$<$<COMPILE_LANGUAGE:CXX>:-g>")
 
@@ -218,6 +224,8 @@ ExternalProject_Add(ava-spec
         -Dlibconfig++_DIR:PATH=${EXTERNAL_BINARY_DIR}/libconfig/lib/cmake/libconfig
         -DCMAKE_C_COMPILER:STRING=${CMAKE_C_COMPILER}
         -DCMAKE_CXX_COMPILER:STRING=${CMAKE_CXX_COMPILER}
+        -DAVA_GEN_TF_SPEC:BOOL=${AVA_GEN_TF_SPEC}
+        -DAVA_GEN_ONNXRT_SPEC:BOOL=${AVA_GEN_ONNXRT_SPEC}
   BUILD_ALWAYS ON
   DEPENDS flatbuffers libconfig
 )
diff --git a/cava/.gitignore b/cava/.gitignore
index ca5b7ad7..5dad30e8 100644
--- a/cava/.gitignore
+++ b/cava/.gitignore
@@ -25,3 +25,5 @@ gti_nw/
 cudart_nw/
 onnx_dump_nw/
 onnx_opt_nw/
+tf_dump_nw
+tf_opt_nw
\ No newline at end of file
diff --git a/cava/CMakeLists.txt b/cava/CMakeLists.txt
index a5fe4727..79b5f84a 100644
--- a/cava/CMakeLists.txt
+++ b/cava/CMakeLists.txt
@@ -86,3 +86,18 @@ ExternalProject_Add(cu_nw
 #)
 
 ###### Define your compilation below ######
+message(STATUS "Whether to compile tensorflow spec")
+if(AVA_GEN_TF_SPEC)
+  message(STATUS "ON")
+  include(samples/tensorflow/CMakeLists.txt)
+else()
+  message(STATUS "OFF")
+endif()
+
+message(STATUS "Whether to compile onnxruntime spec")
+if(AVA_GEN_ONNXRT_SPEC)
+  message(STATUS "ON")
+  include(samples/onnxruntime/CMakeLists.txt)
+else()
+  message(STATUS "OFF")
+endif()
diff --git a/cava/samples/onnxruntime/CMakeLists.txt b/cava/samples/onnxruntime/CMakeLists.txt
index 921d9eb4..ff6eb031 100644
--- a/cava/samples/onnxruntime/CMakeLists.txt
+++ b/cava/samples/onnxruntime/CMakeLists.txt
@@ -8,23 +8,10 @@ foreach(var ${vars})
   endif()
 endforeach()
 
-project(ava-spec)
+project(ava-spec-onnxruntime)
 
 include(ExternalProject)
 
-###### Build customized LLVM ######
-
-ExternalProject_Add(cava
-  PREFIX ava-llvm
-  SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../llvm/build
-  URL "https://github.com/utcs-scea/ava-llvm/releases/download/v7.1.0/ava-llvm-release-7.1.0.tar.gz"
-  URL_HASH MD5=400832522ed255314d6a5848e8f7af6c
-  BUILD_COMMAND ""
-  CONFIGURE_COMMAND ""
-  INSTALL_COMMAND ""
-  UPDATE_DISCONNECTED ON
-)
-
 ###### Compile onnxruntime/onnx_dump.c ######
 
 find_package(PkgConfig REQUIRED)
diff --git a/cava/samples/tensorflow/CMakeLists.txt b/cava/samples/tensorflow/CMakeLists.txt
index 5c171b47..2c2cecc8 100644
--- a/cava/samples/tensorflow/CMakeLists.txt
+++ b/cava/samples/tensorflow/CMakeLists.txt
@@ -8,23 +8,10 @@ foreach(var ${vars})
   endif()
 endforeach()
 
-project(ava-spec)
+project(ava-spec-tf)
 
 include(ExternalProject)
 
-###### Build customized LLVM ######
-
-ExternalProject_Add(cava
-  PREFIX ava-llvm
-  SOURCE_DIR ${CMAKE_CURRENT_SOURCE_DIR}/../llvm/build
-  URL "https://github.com/utcs-scea/ava-llvm/releases/download/v7.1.0/ava-llvm-release-7.1.0.tar.gz"
-  URL_HASH MD5=400832522ed255314d6a5848e8f7af6c
-  BUILD_COMMAND ""
-  CONFIGURE_COMMAND ""
-  INSTALL_COMMAND ""
-  UPDATE_DISCONNECTED ON
-)
-
 ###### Compile tensorflow/tf_dump.c ######
 
 find_package(PkgConfig REQUIRED)