Installation on Debian
Quite a list, still it's not comprehensive.
sudo apt-get install fakeroot debhelper dpatch libcap-dev pkg-config \ libspandsp-dev libssl-dev libsndfile1-dev libpq-dev libmysqlclient15-dev \ libspeex-dev libcurl3-dev unixodbc-dev libcapi20-dev zaptel-source \ libreadline-dev autoconf automake sox doxygen libtool zaptel-source
I used script from wiki to create Debian packages which was slightly modified into make-callweaver-deb.sh to support latest versions.
There is also minor fix callweaver-debian-fix.diff to create correct .deb package, adding missing shared library.