diff --git a/src/include/tcop/variable.h b/src/include/tcop/variable.h
new file mode 100644
index 0000000000..f0df5f9de4
--- /dev/null
+++ b/src/include/tcop/variable.h
@@ -0,0 +1,2 @@
+bool SetPGVariable(const char *, const char *);
+const char *GetPGVariable(const char *);