[trac3663] Error message changed for errcodes.h file

configure.ac

@@ -950,7 +950,7 @@ if test "$PG_CONFIG" != "" ; then
     )
 
     AC_CHECK_HEADERS([utils/errcodes.h],,
-    AC_MSG_ERROR([Missing required header files from PostgreSQL development package]))
+    AC_MSG_ERROR([Missing required header file (errcodes.h) from PostgreSQL server-development package]))
 
     CPPFLAGS=$CPPFLAGS_SAVED
     LIBS=$LIBS_SAVED