see Sourcecode via GIT if you don't compile from the distributed tgz's
First you need to set up your Environment, so the components configure will find Easy Installs libraries:

export CFLAGS=-I/usr/local/ctdlsupport/include
export CPPFLAGS=-I/usr/local/ctdlsupport/include
export LDFLAGS='-L/usr/local/ctdlsupport/lib -Wl,--rpath -Wl,/usr/local/ctdlsupport/lib'

A configure line for citserver might look like that:

./configure --prefix=/usr/local/citadel \
  --with-db=/usr/local/ctdlsupport \
  --with-pam \
  --with-libical \
  --disable-threaded-client

Or webcit might be configured like that:

./configure --prefix=/usr/local/webcit --with-libical

compiling is done with

make 

or

gmake

(depending on your system)

If you want to upgrade one of the depending libraries, you can configure them like that:

./configure --prefix=/usr/local/ctdlsupport

for more configure options please download http://easyinstall.citadel.org/install and search it for the 'configure' calls.