Hi, maybe a "newbie"-question.....

I get a message from the makewhatis.cron, which runs weekly.
About 100 times of
"zcat: stdout: Broken pipe"
What does ist mean. The box is running properly though this message comes.
What does makewhatis.cron do ?
What are the consequences of this error ?
Thanks for Your help
Peter Gandert
(e-smith-box on DSL, uptime 40 days, URL:www.gandert-edv.de)