DISQUS

for the compilation to work (for freebsd 7.0-release), i had to use the information from
http://unix.derkeiler.com/Mailing-Lists/FreeBSD...
and
http://www.freebsd.org/doc/en_US.ISO8859-1/book...

to find out, that the line
SENDMAIL_CFLAGS=-I/usr/local/include -DSASL=2
has to be changed to
SENDMAIL_CFLAGS=-I/usr/local/include/sasl -DSASL

in /etc/make.conf
i also set the environment variable MAKEOBJDIRPREFIX to /usr/obj and performed the cleansing as described in the first link, but I really think that the make.conf line was the important part.