make this file be self contained.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@120008 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/include/clang/Basic/FileSystemOptions.h b/include/clang/Basic/FileSystemOptions.h
index 4f3c2ae03df01227e3a0f06be8636daff442aa6e..81e928da2a70177ff5ce04cf78bfd9205c91fdde 100644 (file)
--- a/include/clang/Basic/FileSystemOptions.h
+++ b/include/clang/Basic/FileSystemOptions.h
@@ -14,6 +14,8 @@
 #ifndef LLVM_CLANG_BASIC_FILESYSTEMOPTIONS_H
 #define LLVM_CLANG_BASIC_FILESYSTEMOPTIONS_H
 
+#include <string>
+
 namespace clang {
 
 /// \brief Keeps track of options that affect how file operations are performed.