Specify the OS default temp directory as the temp dir for the sdk.

emsdk

@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 
-import sys, optparse, subprocess, urllib2, os, os.path, errno, zipfile, string, json, platform, shutil, tarfile, urlparse
+import sys, optparse, subprocess, urllib2, os, os.path, errno, zipfile, string, json, platform, shutil, tarfile, urlparse, tempfile
 
 # EMSDK_DEV is a developer mode flag, which, if true, the SDK is downloaded from a 'staging' online source,
 # instead of the public source. New releases are first deployed to the staging source for testing, before 
@@ -326,7 +326,7 @@ JS_ENGINES = [NODE_JS]
 
   cfg += '''SPIDERMONKEY_ENGINE = ''
 V8_ENGINE = ''
-TEMP_DIR = ''' + "'" + sdk_path(temp_dir) + "'" + '''
+TEMP_DIR = ''' + "'" + tempfile.gettempdir().replace('\\', '/') + "'" + '''
 COMPILER_ENGINE = NODE_JS
 JS_ENGINES = [NODE_JS]
 '''