$OpenBSD: patch-src_mongo_db_matcher_expression_leaf_cpp,v 1.1 2017/10/23 07:44:22 kili Exp $

pcrecpp.h used to expose std::string, which is no longer the case
starting with pcre-8.41.

Index: src/mongo/db/matcher/expression_leaf.cpp
--- src/mongo/db/matcher/expression_leaf.cpp.orig
+++ src/mongo/db/matcher/expression_leaf.cpp
@@ -45,6 +45,8 @@
 
 namespace mongo {
 
+using std::string;
+
 Status LeafMatchExpression::initPath(StringData path) {
     _path = path;
     return _elementPath.init(_path);
