diff --git a/build/builder/build-external.py b/build/builder/build-external.py
index 6e36efb..f79ab9a 100644
--- a/build/builder/build-external.py
+++ b/build/builder/build-external.py
@@ -161,7 +161,10 @@ class BuilderWin(BuilderBase):
         os.chdir(self.OPENSSL_PATH_SRC)
         os.system('""{}" Configure VC-WIN32"'.format(env.perl))
         os.system(r'ms\do_nasm')
-        os.system(r'"{}\VC\bin\vcvars32.bat" && nmake -f ms\nt.mak'.format(env.visual_studio_path))
+        # for vs2015
+        # utils.sys_exec(r'"{}\VC\bin\vcvars32.bat" && nmake -f ms\nt.mak'.format(env.visual_studio_path), direct_output=True)
+        # for vs2017 community
+        utils.sys_exec(r'"{}VC\Auxiliary\Build\vcvars32.bat" && nmake -f ms\nt.mak'.format(env.visual_studio_path), direct_output=True)
 
         for f in _chk_output:
             if not os.path.exists(f):
@@ -175,9 +178,17 @@ class BuilderWin(BuilderBase):
             utils.unzip(os.path.join(PATH_DOWNLOAD, file_name), PATH_EXTERNAL)
             os.rename(os.path.join(PATH_EXTERNAL, 'libssh-{}'.format(env.ver_libssh)), self.LIBSSH_PATH_SRC)
 
+            # cc.n('fix libssh source code... ', end='')
+            # utils.ensure_file_exists(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', 'src', 'sftp.c'))
+            # utils.copy_file(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', 'src'), os.path.join(self.LIBSSH_PATH_SRC, 'src'), 'sftp.c')
             cc.n('fix libssh source code... ', end='')
-            utils.ensure_file_exists(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', 'src', 'sftp.c'))
-            utils.copy_file(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', 'src'), os.path.join(self.LIBSSH_PATH_SRC, 'src'), 'sftp.c')
+            s_name = 'libssh-{}'.format(env.ver_libssh)
+            utils.ensure_file_exists(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', s_name, 'src', 'session.c'))
+            utils.ensure_file_exists(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', s_name, 'src', 'libcrypto.c'))
+            utils.ensure_file_exists(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', s_name, 'src', 'libcrypto-compat.c'))
+            utils.copy_file(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', s_name, 'src'), os.path.join(self.LIBSSH_PATH_SRC, 'src'), 'session.c')
+            utils.copy_file(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', s_name, 'src'), os.path.join(self.LIBSSH_PATH_SRC, 'src'), 'libcrypto.c')
+            utils.copy_file(os.path.join(PATH_EXTERNAL, 'fix-external', 'libssh', s_name, 'src'), os.path.join(self.LIBSSH_PATH_SRC, 'src'), 'libcrypto-compat.c')
 
         out_file_lib = os.path.join(self.LIBSSH_PATH_SRC, 'lib', ctx.target_path, 'ssh.lib')
         out_file_dll = os.path.join(self.LIBSSH_PATH_SRC, 'lib', ctx.target_path, 'ssh.dll')
diff --git a/build/builder/core/env.py b/build/builder/core/env.py
index bc5f40c..82a907e 100644
--- a/build/builder/core/env.py
+++ b/build/builder/core/env.py
@@ -111,7 +111,7 @@ class Env(object):
 
             if self.nasm is None or not os.path.exists(self.nasm):
                 if warn_miss_tool:
-                    cc.w(' - can not locate `nasm`, so I can build openssl.')
+                    cc.w(' - can not locate `nasm`, so I can not build openssl.')
             else:
                 _nasm_path = os.path.abspath(os.path.join(self.nasm, '..'))
                 os.environ['path'] = os.environ['path'] + ';' + _nasm_path
@@ -123,12 +123,12 @@ class Env(object):
 
             if self.perl is None or not os.path.exists(self.perl):
                 if warn_miss_tool:
-                    cc.w(' - can not locate `perl`, so I can build openssl.')
+                    cc.w(' - can not locate `perl`, so I can not build openssl.')
 
             self.visual_studio_path = self._get_visual_studio_path()
             if self.visual_studio_path is None or not os.path.exists(self.visual_studio_path):
                 if warn_miss_tool:
-                    cc.w(' - can not locate Visual Studio installation, so I can build openssl.')
+                    cc.w(' - can not locate Visual Studio installation, so I can build nothing.')
 
             if 'msbuild' in _tmp:
                 self.msbuild = _tmp['msbuild']
@@ -215,7 +215,6 @@ class Env(object):
     #     return p[0] if p is not None else None
 
     def _get_visual_studio_path(self):
-        p = None
         p = self._winreg_read(winreg.HKEY_LOCAL_MACHINE, r'SOFTWARE\WOW6432Node\Microsoft\VisualStudio\SxS\VS7', r'15.0')
         return p[0] if p is not None else None
 
diff --git a/build/builder/core/utils.py b/build/builder/core/utils.py
index f46a9bd..c6aa97f 100644
--- a/build/builder/core/utils.py
+++ b/build/builder/core/utils.py
@@ -269,6 +269,7 @@ def ensure_file_exists(filename):
 
 
 def sys_exec(cmd, direct_output=False, output_codec=None):
+    print(cmd)
     if output_codec is None:
         if env.is_win:
             output_codec = 'gb2312'
diff --git a/external/readme.md b/external/readme.md
index c85bdaf..a98e6fe 100644
--- a/external/readme.md
+++ b/external/readme.md
@@ -4,7 +4,7 @@ teleport项目用到的第三方库
 
 - openssl
   https://www.openssl.org
-  openssl-1.0.2h
+  openssl-1.0.2p
   请按openssl文档所述，编译出openssl的静态库。要编译openssl，需要
   - perl 建议安装ActivePerl http://www.activestate.com/ActivePerl
   - nasm http://www.nasm.us
@@ -17,15 +17,15 @@ teleport项目用到的第三方库
   注意：teleport项目使用源代码直接编译，因此解压缩源代码到此即可。
 - mongoose
   https://github.com/cesanta/mongoose
-  mongoose 6.6
+  mongoose 6.12
   注意：teleport项目使用源代码直接编译，因此解压缩源代码到此即可。
 - sqlite3
   http://sqlite.org/download.html
-  sqlite3-amalgamation-3150200
+  sqlite3-autoconf-3250000
   注意：teleport项目使用源代码直接编译，因此解压缩源代码到此即可。
 - mbedtls
   https://github.com/ARMmbed/mbedtls
-  mbedtls-mbedtls-2.2.1
+  mbedtls-mbedtls-2.12.0
   注意：teleport项目使用源代码直接编译，因此解压缩源代码到此即可。
 - libssh
   https://git.libssh.org/projects/libssh.git/snapshot
@@ -33,7 +33,7 @@ teleport项目用到的第三方库
   Windows平台使用预制的libssh-static工程进行编译。
 - libuv
   https://github.com/libuv/libuv
-  v1.11.0.zip
+  v1.23.0.zip
   注意：teleport项目使用源代码直接编译，因此解压缩源代码到此即可。