error: iostream-ssl.h: No such file or directory

[Tobi]

Hi list

I'm trying to build dovecot 2.2.15 from source on a debian wheezy 
(64bit). As I wanted to get starttls support for dovecot's lmtp I got 
the patched files from here: 
http://hg.dovecot.org/dovecot-2.2/rev/297192cfbd37

My ./configure

./configure --prefix=/usr/local/dovecot-test --with-solr --with-mysql 
--with-sql --without-shadow --without-pam

configure seems to run fine but the following make ends up in

client.c:17:26: fatal error: iostream-ssl.h: No such file or directory
compilation terminated.
make[3]: *** [client.o] Error 1
make[3]: Leaving directory `/usr/local/src/dovecot-2.2.15/src/lmtp'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory `/usr/local/src/dovecot-2.2.15/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/usr/local/src/dovecot-2.2.15'
make: *** [all] Error 2

Any ideas what I'm missing? libssl-dev is installed via apt

Thanks for any idea
Cheers

tobi