Defining custom structs in skeleton

Hi, I am currently trying to get a C librabry into a PHP extension but I am having problems when 'making' the auto-generated extension files. I think the problem comes from the way I'm trying to use data types. I followed the steps described in http://talks.php.net/show/extending-php-apachecon2003 to define the functions I'd like to use from the libssh library, create a .def file, use ext_skel, update config.m4, configure... Then "make" gives me plenty of errors like: /tmp/ssh/ssh.c: In function `zif_open_session_channel': /tmp/ssh/ssh.c:232: error: parse error before '?' token /tmp/ssh/ssh.c:232: error: parse error before '?' token It seems like the problem is the special data types definitions in libssh. For example, I want to import this function: SSH_SESSION *ssh_connect(SSH_OPTIONS *options); Which uses SSH_SESSION and SSH_OPTIONS, both being structs defined earlier in the libssh library. And for this error case, I would like to use CHANNEL *open_session_channel(SSH_SESSION *session,int window,int maxpacket); Which also uses SSH_SESSION. The lines around 232 (indicated by >>>) in ssh.c are: PHP_FUNCTION(open_session_channel) { int argc = ZEND_NUM_ARGS(); int session_id = -1; long window; long maxpacket; zval *session = NULL; if (zend_parse_parameters(argc TSRMLS_CC, "rll", &session, &window, &maxpacket) == FAILURE) return; if (session) { >>> ZEND_FETCH_RESOURCE(???, ???, session, session_id, "???", ???_rsrc_id); } php_error(E_WARNING, "open_session_channel: not yet implemented"); } I couldn't find any doc about this kind of "features" of extension-making, so I didn't even try to declare those data types in my definition file and have used "resource" instead of those SSH_SESSION types. Could someone point me out on some kind of doc or help me with this? is in ssh.c: Obviously I need to understand how custom data types can be defined in my skeleton file, then maybe I will get things right in ssh.c. Thanks, Yannick