cannot compile openconnect 7.06

[Klaus Gast]

Hi,

I am trying to compile openconnect version 7.06 on my Synology NAS DS
212+
This works fine up to version 7.04 but if I try to compile 7.06 I always
end up with the following error:

=============================================================
./.libs/libopenconnect.so: undefined reference to `esp_shutdown'
collect2: ld returned 1 exit status
=============================================================

I could not find anything in the mail archive nor on the internet about
this particualt error and what could be wrong here. Any kind of help
would be great.

Regards

Klaus