Index: lldb/trunk/lit/helper/toolchain.py
===================================================================
--- lldb/trunk/lit/helper/toolchain.py
+++ lldb/trunk/lit/helper/toolchain.py
@@ -78,7 +78,7 @@
             sdk_path = lit.util.to_string(out)
             lit_config.note('using SDKROOT: %r' % sdk_path)
             flags = ['-isysroot', sdk_path]
-    elif platform.system() in ['OpenBSD']:
+    elif platform.system() in ['OpenBSD', 'Linux']:
         flags = ['-pthread']