Which package provides OpenSSL headers?

[Bill Wagner <bwagner@gory.org>]

I'm building apache2 with mod_ssl support, but during the 'configure'
process, it reports: 

--- 
checking for SSL/TLS toolkit base... /usr 
checking for SSL/TLS toolkit version... OpenSSL 0.9.6c 21 dec 2001 
configure: WARNING: OpenSSL versions prior to 0.9.6e have known security
holes 
checking for SSL/TLS toolkit includes... configure: error: OpenSSL
headers not found 
--- 

So I installed the version available in unstable/testing and thought
that would solve the problem.  But I'm still getting that error.  

Here's what a 'dpkg -s openssl' says: 

--- 
# dpkg -s openssl 
Package: openssl 
Status: install ok installed 
Priority: optional 
Section: utils 
Installed-Size: 1343 
Maintainer: Christoph Martin <christoph.martin@uni-mainz.de> 
Version: 0.9.6g-9 
Depends: libc6 (>= 2.2.4-4), libssl0.9.6, perl 
Conflicts: ssleay (<< 0.9.2b) 
Conffiles: 
/etc/ssl/openssl.cnf f5ea1059b4517109d68eba9927f24643 
--- 

So if the openssl package doesn't provide the header files, what package
does? 

Thanks in advance, 

Bill