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diff --git a/libpq/postgresql/postgres_ext.h b/libpq/postgresql/postgres_ext.h
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-/*-------------------------------------------------------------------------
- *
- * postgres_ext.h
- *
- * This file contains declarations of things that are visible everywhere
- * in PostgreSQL *and* are visible to clients of frontend interface libraries.
- * For example, the Oid type is part of the API of libpq and other libraries.
- *
- * Declarations which are specific to a particular interface should
- * go in the header file for that interface (such as libpq-fe.h). This
- * file is only for fundamental Postgres declarations.
- *
- * User-written C functions don't count as "external to Postgres."
- * Those function much as local modifications to the backend itself, and
- * use header files that are otherwise internal to Postgres to interface
- * with the backend.
- *
- * src/include/postgres_ext.h
- *
- *-------------------------------------------------------------------------
- */
-
-#ifndef POSTGRES_EXT_H
-#define POSTGRES_EXT_H
-
-#include "pg_config_ext.h"
-
-/*
- * Object ID is a fundamental type in Postgres.
- */
-typedef unsigned int Oid;
-
-#ifdef __cplusplus
-#define InvalidOid (Oid(0))
-#else
-#define InvalidOid ((Oid) 0)
-#endif
-
-#define OID_MAX UINT_MAX
-/* you will need to include <limits.h> to use the above #define */
-
-/* Define a signed 64-bit integer type for use in client API declarations. */
-typedef PG_INT64_TYPE pg_int64;
-
-
-/*
- * Identifiers of error message fields. Kept here to keep common
- * between frontend and backend, and also to export them to libpq
- * applications.
- */
-#define PG_DIAG_SEVERITY 'S'
-#define PG_DIAG_SEVERITY_NONLOCALIZED 'V'
-#define PG_DIAG_SQLSTATE 'C'
-#define PG_DIAG_MESSAGE_PRIMARY 'M'
-#define PG_DIAG_MESSAGE_DETAIL 'D'
-#define PG_DIAG_MESSAGE_HINT 'H'
-#define PG_DIAG_STATEMENT_POSITION 'P'
-#define PG_DIAG_INTERNAL_POSITION 'p'
-#define PG_DIAG_INTERNAL_QUERY 'q'
-#define PG_DIAG_CONTEXT 'W'
-#define PG_DIAG_SCHEMA_NAME 's'
-#define PG_DIAG_TABLE_NAME 't'
-#define PG_DIAG_COLUMN_NAME 'c'
-#define PG_DIAG_DATATYPE_NAME 'd'
-#define PG_DIAG_CONSTRAINT_NAME 'n'
-#define PG_DIAG_SOURCE_FILE 'F'
-#define PG_DIAG_SOURCE_LINE 'L'
-#define PG_DIAG_SOURCE_FUNCTION 'R'
-
-#endif /* POSTGRES_EXT_H */