Apache error running mod_cgi

Hello,

I'm having a problem trying to run a cgi (mailgraph.cgi) script in
Apache 2.0.55. When I go to that cgi, I get the following error
showing up in my error log for apache:

/usr/sbin/httpd: symbol lookup error: /usr/sbin/httpd: undefined
symbol: apr_procattr_addrspace_set


Here is the output of my httpd -l

httpd -l
Compiled in modules:
core.c
mod_access.c
mod_auth.c
mod_auth_anon.c
mod_auth_dbm.c
mod_auth_digest.c
mod_ext_filter.c
mod_include.c
mod_deflate.c
mod_log_config.c
mod_env.c
mod_mime_magic.c
mod_expires.c
mod_headers.c
mod_usertrack.c
mod_unique_id.c
mod_setenvif.c
mod_ssl.c
prefork.c
http_core.c
mod_mime.c
mod_status.c
mod_autoindex.c
mod_asis.c
mod_info.c
mod_suexec.c
mod_cgi.c
mod_vhost_alias.c
mod_negotiation.c
mod_dir.c
mod_imap.c
mod_actions.c
mod_speling.c
mod_userdir.c
mod_alias.c
mod_rewrite.c
mod_so.c


Does anyone know what is causing this error?