diff --git a/.gitignore b/.gitignore
index 4ebc17a7..db1c7203 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,3 +5,5 @@ cmake-build-release
 .idea
 build-debug.sh
 __pycache__
+scripts
+prebuilt
\ No newline at end of file
diff --git a/CMakeLists.txt b/CMakeLists.txt
index f74d6395..683455dc 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,8 +2,8 @@ cmake_minimum_required(VERSION 3.17)
 project(lite.ai.toolkit)
 
 set(CMAKE_CXX_STANDARD 11)
-set(VERSION_STRING 0.1.0)
-set(SOVERSION_STRING 0.1.0)
+set(VERSION_STRING 0.1.1)
+set(SOVERSION_STRING 0.1.1)
 include(cmake/lite.ai.toolkit-platform.cmake)  # checking platform
 
 message("====================================  Lite.AI.ToolKit  ${VERSION_STRING} =============================")
@@ -15,16 +15,19 @@ message("Platform Name: ${PLATFORM_NAME}")
 message("Root Path: ${CMAKE_SOURCE_DIR}")
 message("================================================================================")
 
+
 # root dir
 set(LITE_AI_ROOT_DIR ${CMAKE_SOURCE_DIR})
-# dir for built files.
-set(BUILD_LITE_AI_DIR ${LITE_AI_ROOT_DIR}/build/lite.ai.toolkit)
+# set default build dir for lite.ai.toolkit
+if (NOT DEFINED BUILD_LITE_AI_DIR)
+    set(BUILD_LITE_AI_DIR ${LITE_AI_ROOT_DIR}/build/lite.ai.toolkit)
+endif()
 set(LIBRARY_OUTPUT_PATH ${BUILD_LITE_AI_DIR}/lib)
 set(EXECUTABLE_OUTPUT_PATH ${BUILD_LITE_AI_DIR}/bin)
 
 # options
 option(LITE_AI_BUILD_LIB "whether to build shared libraries." ON) # now, ON only
-option(LITE_AI_BUILD_TEST "whether to build shared libraries." ON) # now, ON only
+option(LITE_AI_BUILD_TEST "whether to build test examples." ON)
 option(INCLUDE_OPENCV "whether to include OpenCV into lite.ai.toolkit." ON)
 # engine backend: config.h.in -> config.h
 option(ENABLE_ONNXRUNTIME "whether to enable ONNXRuntime engine" ON)
diff --git a/build.sh b/build.sh
index 1f3413aa..f612f188 100644
--- a/build.sh
+++ b/build.sh
@@ -1,15 +1,18 @@
 #!/bin/bash
-if [ ! -d ./build ]; then
-  mkdir build
+
+BUILD_DIR=build
+
+if [ ! -d "${BUILD_DIR}" ]; then
+  mkdir "${BUILD_DIR}"
+  echo "creating build dir: ${BUILD_DIR} ..."
 else
-  echo "build directory exist! clearing ... "
-  rm -rf ./build/* && echo "clear built files done ! & rebuilding ... "
+  echo "build dir: {BUILD_DIR} directory exist! ..."
 fi
 
-cd build && cmake \
+cd "${BUILD_DIR}" && pwd && cmake .. \
   -DCMAKE_BUILD_TYPE=MinSizeRel \
   -DINCLUDE_OPENCV=ON \
   -DENABLE_MNN=OFF \
   -DENABLE_NCNN=OFF \
-  -DENABLE_TNN=OFF \
-  .. && make -j8
+  -DENABLE_TNN=OFF &&
+  make -j8
diff --git a/cmake/lite.ai.toolkit-cmd.cmake b/cmake/lite.ai.toolkit-cmd.cmake
index b2ab4a48..aebf8601 100644
--- a/cmake/lite.ai.toolkit-cmd.cmake
+++ b/cmake/lite.ai.toolkit-cmd.cmake
@@ -42,7 +42,7 @@ function(add_lite_ai_toolkit_shared_library version soversion)
     set_target_properties(lite.ai.toolkit PROPERTIES VERSION ${version} SOVERSION ${soversion})
 
     message("Installing Lite.AI.ToolKit Headers ...")
-    file(INSTALL ${LITE_HEAD} DESTINATION ${CMAKE_SOURCE_DIR}/build/lite.ai.toolkit/include/lite)
+    file(INSTALL ${LITE_HEAD} DESTINATION ${BUILD_LITE_AI_DIR}/include/lite)
 
     message(">>>> Added Shared Library: lite.ai.toolkit !")
 
@@ -108,7 +108,7 @@ function(add_lite_ai_toolkit_engines_headers_command)
         add_custom_command(TARGET lite.ai.toolkit
                 PRE_BUILD
                 COMMAND ${CMAKE_COMMAND} -E copy_directory ${LITE_AI_ROOT_DIR}/ncnn ${BUILD_LITE_AI_DIR}/include/ncnn
-                COMMAND ${CMAKE_COMMAND} -E echo "Installing NCNN headers to ${BUILD_LITE_AI_DIR}/ncnn ... done!"
+                COMMAND ${CMAKE_COMMAND} -E echo "Installing NCNN headers to ${BUILD_LITE_AI_DIR}/include/ncnn ... done!"
                 )
     endif()