Exclude expand_path when INSTALL is not defined

tz.cpp

@@ -4,6 +4,7 @@
 // Copyright (c) 2015 Ville Voutilainen
 // Copyright (c) 2016 Alexander Kormanovsky
 // Copyright (c) 2016, 2017 Jiangang Zhuang
+// Copyright (c) 2017 Nicolas Veloz Savino
 //
 // Permission is hereby granted, free of charge, to any person obtaining a copy
 // of this software and associated documentation files (the "Software"), to deal
@@ -189,6 +190,7 @@ get_download_folder()
 
 #else // !_WIN32
 
+#  ifndef INSTALL
 
 static
 std::string
@@ -206,6 +208,8 @@ expand_path(std::string path)
 #    endif
 }
 
+#  endif  // !INSTALL
+
 #endif  // !_WIN32
 
 namespace date