jfc'log

First:
boinc_client -attach_project
It will failed.
Second:
Edit the file client_state.xml, add something like the following:
+++
<proxy_info>
<use_http_proxy/>
<http_server_name>wexpert</http_server_name>
<http_server_port>8888</http_server_port>
</proxy_info>
+++
Thrid:
boinc_client -attach_project
That should work.

First after download:
+++
jfclere@jfcexpert:~/BOINC> boincmgr
boincmgr: /lib/libpthread.so.0: version `GLIBC_2.3.2' not found (required by boincmgr)
+++
Now try to compile it...
+++
configure --disable-server
make
make install
boinc_client -help
boinc_client -attach
+++
Here next problem, where is the mail that contains the "account key"... Deleted already ;-(
Not a big problem grep "Account Key" in /.mozilla/jfclere/4dcgmgr3.slt/Mail/pop3.sinix.net/*
+++
AAAA-private: Account Key: _32_hex_char_string_
+++
Now the key is saved and boinc is running.