diff --git a/external/capstone.cmake b/external/capstone.cmake
deleted file mode 100644
index dee5dcf..0000000
--- a/external/capstone.cmake
+++ /dev/null
@@ -1,60 +0,0 @@
-# Copyright (c) 2019 vesoft inc. All rights reserved.
-#
-# This source code is licensed under Apache 2.0 License,
-# attached with Common Clause Condition 1.0, found in the LICENSES directory.
-
-set(name external_capstone)
-set(build_root ${CMAKE_CURRENT_BINARY_DIR}/external)
-ExternalProject_Add(
-    ${name}
-    GIT_REPOSITORY https://github.com/aquynh/capstone.git
-    GIT_TAG next
-    GIT_SHALLOW TRUE
-    GIT_PROGRESS TRUE
-    PREFIX ${build_root}/${name}
-    TMP_DIR ${build_root}/build-info
-    STAMP_DIR ${build_root}/build-info
-    DOWNLOAD_DIR ${build_root}/build-info
-    SOURCE_DIR ${build_root}/${name}/source
-    UPDATE_COMMAND ""
-    CMAKE_ARGS
-        -DCAPSTONE_X86_SUPPORT=ON
-        -DCAPSTONE_ARM_SUPPORT=OFF
-        -DCAPSTONE_ARM64_SUPPORT=ON
-        -DCAPSTONE_M680X_SUPPORT=OFF
-        -DCAPSTONE_M68K_SUPPORT=OFF
-        -DCAPSTONE_MIPS_SUPPORT=OFF
-        -DCAPSTONE_MOS65XX_SUPPORT=OFF
-        -DCAPSTONE_PPC_SUPPORT=OFF
-        -DCAPSTONE_SPARC_SUPPORT=OFF
-        -DCAPSTONE_SYSZ_SUPPORT=OFF
-        -DCAPSTONE_XCORE_SUPPORT=OFF
-        -DCAPSTONE_TMS320C64X_SUPPORT=OFF
-        -DCAPSTONE_M680X_SUPPORT=OFF
-        -DCAPSTONE_EVM_SUPPORT=OFF
-        -DCAPSTONE_BUILD_DIET=OFF
-        -DCAPSTONE_X86_REDUCE=OFF
-        -DCAPSTONE_BUILD_TESTS=OFF
-        -DCAPSTONE_BUILD_STATIC=ON
-        -DCAPSTONE_BUILD_SHARED=OFF
-        -DCMAKE_BUILD_TYPE=Release
-        -DCAPSTONE_INSTALL=ON
-        -DCMAKE_INSTALL_PREFIX=${build_root}/install
-    BUILD_COMMAND make -s
-    BUILD_IN_SOURCE 1
-    INSTALL_COMMAND make -s install
-    LOG_CONFIGURE TRUE
-    LOG_BUILD TRUE
-    LOG_INSTALL TRUE
-)
-
-ExternalProject_Add_Step(${name} clean
-    EXCLUDE_FROM_MAIN TRUE
-    ALWAYS TRUE
-    DEPENDEES configure
-    COMMAND make clean -j
-    COMMAND rm -f <STAMP_DIR>/${name}-build
-    WORKING_DIRECTORY <SOURCE_DIR>
-)
-
-ExternalProject_Add_StepTargets(${name} clean)
diff --git a/external/clang-build-analyzer.cmake b/external/clang-build-analyzer.cmake
deleted file mode 100644
index bdbf1bd..0000000
--- a/external/clang-build-analyzer.cmake
+++ /dev/null
@@ -1,38 +0,0 @@
-# Copyright (c) 2019 vesoft inc. All rights reserved.
-#
-# This source code is licensed under Apache 2.0 License,
-# attached with Common Clause Condition 1.0, found in the LICENSES directory.
-
-set(name clang_build_analyzer)
-set(build_root ${CMAKE_CURRENT_BINARY_DIR}/external)
-ExternalProject_Add(
-    ${name}
-    GIT_REPOSITORY https://github.com/dutor/ClangBuildAnalyzer.git
-    GIT_TAG master
-    GIT_SHALLOW TRUE
-    GIT_PROGRESS TRUE
-    PREFIX ${build_root}/${name}
-    TMP_DIR ${build_root}/build-info
-    STAMP_DIR ${build_root}/build-info
-    DOWNLOAD_DIR ${build_root}/build-info
-    SOURCE_DIR ${build_root}/${name}/source
-    UPDATE_COMMAND ""
-    CONFIGURE_COMMAND ""
-    BUILD_COMMAND make -f <SOURCE_DIR>/projects/make/Makefile LDFLAGS=-static
-    BUILD_IN_SOURCE 1
-    INSTALL_COMMAND install -D -s <SOURCE_DIR>/build/ClangBuildAnalyzer ${build_root}/install/bin/clang-build-analyzer
-    LOG_CONFIGURE TRUE
-    LOG_BUILD TRUE
-    LOG_INSTALL TRUE
-)
-
-ExternalProject_Add_Step(${name} clean
-    EXCLUDE_FROM_MAIN TRUE
-    ALWAYS TRUE
-    DEPENDEES configure
-    COMMAND make clean
-    COMMAND rm -f <STAMP_DIR>/${name}-build
-    WORKING_DIRECTORY <SOURCE_DIR>
-)
-
-ExternalProject_Add_StepTargets(${name} clean)