Index: lib/Driver/Driver.cpp
===================================================================
--- lib/Driver/Driver.cpp	(revision 169957)
+++ lib/Driver/Driver.cpp	(working copy)
@@ -238,7 +238,8 @@
   if (char *env = ::getenv("COMPILER_PATH")) {
     StringRef CompilerPath = env;
     while (!CompilerPath.empty()) {
-      std::pair<StringRef, StringRef> Split = CompilerPath.split(':');
+      std::pair<StringRef, StringRef> Split 
+        = CompilerPath.split(llvm::sys::PathSeparator);
       PrefixDirs.push_back(Split.first);
       CompilerPath = Split.second;
     }