[asterisk-users] Voicemail IMAP ./configure error

[c james]

I have c-client installed on a 64bit system running Gentoo.  I am trying
to run configure so I can test the IMAP voicemail functionality. But

asterisk-1.4.22 # ./configure --with-imap=/usr/include/imap

just gives me the following error.

checking for gnutls_bye in -lgnutls... no
checking for UW IMAP Toolkit c-client library... no
checking for system c-client library...... no
configure: ***
configure: *** The UW IMAP Toolkit installation on this system appears
to be broken.
configure: *** Either correct the installation, or run configure
configure: *** including --without-imap.

c-client is installed.

voicemail1 asterisk-1.4.22 # equery files c-client
[ Searching for packages matching c-client... ]
* Contents of net-libs/c-client-2006k:
/usr/include/imap/c-client.h
  ... bunch of others
/usr/include/imap/utf8aux.h
/usr/lib64/c-client.a
/usr/lib64/libc-client.a -> c-client.a
/usr/lib64/libc-client.so.1.0.0

Can anyone point me in the right direction?  Google doesn't seem to help
here.