which package contains "stdlib.c"?

[NN NN]

Hi!
I can't install the Perl DBI-1.59 on my ubuntu 7.04
with
the perl v5.8.8 built for i486-linux-gnu-thread-multi.
It seems like I'm lacking some headers, and I've been
told that I should look for the package that contains
"stdlib.c".
What package contains "stdlib.c"?
Is that really all I need?
Can I somehow search for the package vi the keyword
"stdlib.c"? I mean, how can I find out myself which
package contains "stdlib.c"?
Thanks!