diff --git a/scripts/build-win.py b/scripts/build-win.py
index b2f70e97f..f4b64ab51 100644
--- a/scripts/build-win.py
+++ b/scripts/build-win.py
@@ -172,7 +172,7 @@ def main():
     parser.add_argument('--ssl_root', help='Path for OpenSSL.')
     parser.add_argument('--msdk_root', help='Path for MSDK.')
     parser.add_argument('--quic_root', help='Path to QUIC library. Not supported yet.')
-    parser.add_argument('--sio_root', required=True, help='Path to Socket.IO cpp. Headers in include sub-folder, libsioclient_tls.a in lib sub-folder.')
+    parser.add_argument('--sio_root', required=False, help='Path to Socket.IO cpp. Headers in include sub-folder, libsioclient_tls.a in lib sub-folder.')
     parser.add_argument('--scheme', default='debug', choices=('debug', 'release'),
                         help='Schemes for building. Supported value: debug, release')
     parser.add_argument('--gn_gen', default=False, action='store_true',
@@ -185,8 +185,11 @@ def main():
                         help='To generate the API document.')
     parser.add_argument('--output_path', help='Path to copy sdk.')
     parser.add_argument('--cloud_gaming', default=False,
-                        help='Build for cloud gaming. Default to false.', action='store_true')
+                        help='Build for cloud gaming. This option is not intended to be used in general purpose. Setting to true may result unexpected behaviors. Default to false.', action='store_true')
     opts = parser.parse_args()
+    if not opts.sio_root and not opts.cloud_gaming:
+        print("sio_root is missing.")
+        return 1
     if opts.ssl_root and not os.path.exists(os.path.expanduser(opts.ssl_root)):
         print('Invalid ssl_root.')
         return 1
diff --git a/scripts/build_linux.py b/scripts/build_linux.py
index ce979f9e1..0c8b712ce 100755
--- a/scripts/build_linux.py
+++ b/scripts/build_linux.py
@@ -45,7 +45,7 @@ def gen_lib_path(scheme):
     out_lib = OUT_LIB % {'scheme': scheme}
     return os.path.join(HOME_PATH + r'/out', out_lib)
 
-def gngen(arch, ssl_root, msdk_root, quic_root, scheme, tests, use_gcc, fake_audio, shared, cloud_gaming):
+def gngen(arch, sio_root, ssl_root, msdk_root, quic_root, scheme, tests, use_gcc, fake_audio, shared, cloud_gaming):
     gn_args = list(GN_ARGS)
     gn_args.append('target_cpu="%s"' % arch)
     if scheme == 'release':
@@ -58,6 +58,9 @@ def gngen(arch, ssl_root, msdk_root, quic_root, scheme, tests, use_gcc, fake_aud
         gn_args.append('libsrtp_ssl_root="%s/include"' % ssl_root)
     else:
         gn_args.append('rtc_build_ssl=true')
+    if sio_root:
+        # If sio_root is not specified, conference SDK is not able to build.
+        gn_args.append('owt_sio_header_root="%s"' % (sio_root + '/include'))
     if msdk_root:
         if arch == 'x86':
             msdk_lib = msdk_root + r'/lib32'
@@ -180,6 +183,7 @@ def main():
     parser.add_argument('--arch', default='x86', dest='arch', choices=('x86', 'x64'),
                         help='Target architecture. Supported value: x86, x64')
     parser.add_argument('--ssl_root', help='Path for OpenSSL.')
+    parser.add_argument('--sio_root', required=False, help='Path to Socket.IO cpp. Headers in include sub-folder, libsioclient_tls.a in lib sub-folder.')
     parser.add_argument('--msdk_root', help='Path for MSDK.')
     parser.add_argument('--quic_root', help='Path to QUIC library')
     parser.add_argument('--scheme', default='debug', choices=('debug', 'release'),
@@ -197,11 +201,13 @@ def main():
     parser.add_argument('--output_path', help='Path to copy sdk.')
     parser.add_argument('--use_gcc', help='Compile with GCC and libstdc++. Default is clang and libc++.', action='store_true')
     parser.add_argument('--shared', default=False,  help='Build shared libraries. Default to static.', action='store_true')
-    parser.add_argument('--cloud_gaming', default=False,  help='Build for cloud gaming. Default to false.', action='store_true')
+    parser.add_argument('--cloud_gaming', default=False,  help='Build for cloud gaming. This option is not intended to be used in general purpose. Setting to true may result unexpected behaviors. Default to false.', action='store_true')
     opts = parser.parse_args()
-    print(opts)
+    if not opts.sio_root and not opts.cloud_gaming:
+        print("sio_root is missing.")
+        return 1
     if opts.gn_gen:
-        if not gngen(opts.arch, opts.ssl_root, opts.msdk_root, opts.quic_root, opts.scheme, opts.tests, opts.use_gcc, opts.fake_audio, opts.shared, opts.cloud_gaming):
+        if not gngen(opts.arch, opts.sio_root, opts.ssl_root, opts.msdk_root, opts.quic_root, opts.scheme, opts.tests, opts.use_gcc, opts.fake_audio, opts.shared, opts.cloud_gaming):
             return 1
     if opts.sdk:
          if not ninjabuild(opts.arch, opts.scheme, opts.shared):
diff --git a/talk/owt/BUILD.gn b/talk/owt/BUILD.gn
index 65ba5bfaf..083d36817 100644
--- a/talk/owt/BUILD.gn
+++ b/talk/owt/BUILD.gn
@@ -90,6 +90,8 @@ static_library("owt_deps") {
 
 if (!is_ios) {
   if (is_component_build) {
+    # Component build is only supported by cloud gaming mode on Linux.
+    assert(owt_cloud_gaming)
     shared_library("owt") {
       visibility = [ "*" ]
       deps = [
@@ -100,31 +102,19 @@ if (!is_ios) {
       if (rtc_enable_protobuf) {
         deps += [ "//third_party/protobuf:protobuf_lite" ]
       }
-
-      if (!rtc_build_ssl) {
-        if (is_win) {
-          libs = [
-            "libcrypto.lib",
-            "libssl.lib",
-          ]
-        } else {
-          libs = [
-            "crypto",
-            "ssl",
-          ]
-        }
-      }
     }
   } else {
     static_library("owt") {
       deps = [
         ":owt_sdk_base",
-        ":owt_sdk_conf",
         ":owt_sdk_p2p",
         "//third_party/webrtc",
         "//third_party/webrtc:webrtc",
         "//third_party/webrtc/api:libjingle_peerconnection_api",
       ]
+      if (!owt_cloud_gaming) {
+        deps += [ ":owt_sdk_conf" ]
+      }
       complete_static_lib = true
     }
   }