Sort was including the trailing comma and getting the order wrong. (Specifically, it was comparing "sh," with "sha1sum," and putting sha1sum first in generated/newtoys.h so the binary search wasn't finding sha1sum. Alas, you can't feed separate beginning and ending delimiters to "sort -t". The fix is to copy the appropriate field out with sed, duplicate it at the start of the string where it's easy to compare, and then remove it again with a second sed after the sort.

/* vi: set sw=4 ts=4:
 *
 * bzcat.c - decompress stdin to stdout using bunzip2.
 *
 * Copyright 2007 Rob Landley <rob@landley.net>
 *
 * Not in SUSv3.

USE_BZCAT(NEWTOY(bzcat, NULL, TOYFLAG_USR|TOYFLAG_BIN))

config BZCAT
	bool "bzcat"
	default n
	help
	  usage: bzcat [filename...]

	  Decompress listed files to stdout.  Use stdin if no files listed.
*/

#include "toys.h"

void bzcat_main(void)
{
	bunzipStream(0, 1);
}