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README.md
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@@ -59,18 +59,23 @@ Setup. Needed modules are installed.
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     ./setup_module
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+If this fail and extlib directory already exists, try to remove "extlib" and run "./setup_module" again.
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+
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+    rm -rf extlib
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+    ./setup_module
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+
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 Check if module setup success . Run the following command.
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     prove t
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-If "syntax OK" is displayed, setup is sucseed.
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+If "syntax OK" is displayed, setup is sucseed. 
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 Setup database.
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     ./setup_database
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 If you used Gitprep version 1 and upgrage it to version 2, you need upgrade database
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-by the following command.
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+by the following command
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     # Backup gitprep directory for safety
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     cd ..
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@@ -433,6 +438,11 @@ If you install perl 5.10.1+ by perlbrew, you can install latest GitPrep.
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 ### I know information about GitPrep 2.0 upgrading.
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+If you use GitPrep on Perl 5.8 and install newer perl by perlbrew,
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+you must remove extlib directory before "./setup_module" command.
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+  rm -rf extlib
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+
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 You should know the following small changes.
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 **1. X-Forwarded-HTTPS header is deprecated. use  X-Forwarded-Proto header.**