./configure --enable-cgibindir=/home/www/sysnet/cgi-bin/ \
  --enable-imagedir=/home/www/sysnet/public_html/images/sqwebmail/ \
  --enable-imageurl=/images/sqwebmail/ --with-authshadow --with-authvchkpw \
  --without-authpwd --without-authpam --without-authuserdb \
  --without-authldap --without-authdaemon
  make configure-check
  make
  make check
  make install-strip       # Do a make install if this doesn't work
  make install-configure   # Install configuration files.

gentoo:
./configure --without-authpwd --without-authshadow --without-authpam \
 --without-authuserdb --without-authldap --without-authdaemon \
 --with-authvchkpw --enable-webpass=no \
 --enable-imagedir=/home/httpd/htdocs/images/sqwebmail \
 --enable-cgibindir=/home/httpd/cgi-bin --enable-imageurl=/images/sqwebmail/ \
 --enable-mimetypes=/etc/apache/conf/mime.types

./configure --enable-htmldir=/home/httpd/htdocs/ \
 --enable-cgibindir=/home/httpd/cgi-bin/ --enable-modify-quota \
 --enable-vpopgroup=vpopmail