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--- a/src/utils/pathut.h
+++ b/src/utils/pathut.h
@@ -118,6 +118,7 @@
 #ifdef _WIN32
 /// Convert \ separators to /
 void path_slashize(std::string& s);
+void path_backslashize(std::string& s);
 #endif
 
 /// Lock/pid file class. This is quite close to the pidfile_xxx