m4_divert(-1)`'m4_dnl 
m4_changecom(`##')
m4_define(`needz',`m4_ifdef(`HAVE`$1'',`',`needz1(`$1')')')
m4_define(`needz1',`m4_define(`HAVE`$1'',1)`'m4_divert(1)$1
m4_divert(-1)')