Courier Imap

Hola experto estoy instalado el courier-imap pero me sale este error al compilar:
checking for gcc... Gcc
checking for C compiler default output... A.out
checking whether the C compiler works... Yes
checking whether we are cross compiling... No
checking for suffix of executables...
checking for suffix of object files... O
checking whether we are using the GNU C compiler... Yes
checking whether gcc accepts -g... Yes
checking for gcc option to accept ANSI C... None needed
checking for gawk... Gawk
checking for a BSD-compatible install... /usr/bin/install -c
checking whether ln -s works... Yes
checking whether make sets $(MAKE)... Yes
checking for perl5... No
checking for perl... /usr/bin/perl
checking for sysconftool...... ././sysconftool
checking for env... /bin/env
checking whether build environment is sane... Yes
checking for style of include used by make... GNU
checking dependency style of gcc... Gcc3
configure: WARNING: === Do not compile Courier-IMAP as root. Compile
configure: WARNING: === Courier-IMAP as a non-root user then su to
configure: WARNING: === root before running make install. You must now
configure: WARNING: === remove this entire directory and then extract the
configure: WARNING: === source code from the tarball as a non-root user
configure: WARNING: === and rerun the configure script. If you have read
configure: WARNING: === the INSTALL file you should have known this. So
configure: WARNING: === you better read INSTALL again.
La instalación la estoy haciendo como administrador, no se lo que es este error, me puede decir como configurarlo o alguna página q me indique como hacerlo.
Gracias de antemano.
Un Salud.