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Add note that BLCKSZ must be a power of 2.

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Original file line number	Diff line number	Diff line change
`@@ -8,7 +8,7 @@`
`8`	`8`	`* or in pg_config.h afterwards. Of course, if you edit pg_config.h, then your`
`9`	`9`	`* changes will be overwritten the next time you run configure.`
`10`	`10`	`*`
`11`		`- * $Id: pg_config.h.in,v 1.17 2002/02/23 04:17:46 petere Exp $`
	`11`	`+ * $Id: pg_config.h.in,v 1.18 2002/02/2517:11:22 tgl Exp $`
`12`	`12`	`*/`
`13`	`13`
`14`	`14`	`#ifndefPG_CONFIG_H`
`@@ -124,6 +124,7 @@`
`124`	`124`	`* should reduce the need to have large tuples, since fields can now`
`125`	`125`	`* be spread across multiple tuples).`
`126`	`126`	`*`
	`127`	`+ * BLCKSZ must be a power of 2.`
`127`	`128`	`* The maximum possible value of BLCKSZ is currently 2^15 (32768).`
`128`	`129`	`* This is determined by the 15-bit widths of the lp_off and lp_len`
`129`	`130`	`* fields in ItemIdData (see include/storage/itemid.h).`

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