I have to ask
what is it you are trying to do
from the first post it looks like you want to install some VERY VERY old and unsupported version of "courier-0.63.0 ( from 2009)"
The current is "courier-0.66.3.tar.bz2 "
and it looks like you are fallowing WHAT
bits and pieces of different "how to's" for different OS's
WHY this very old tarbal ??????
the current is 66.3
cent already has a DEFAULT folder called "Downloads"
there was no need to make a second folder but with a lower case "d"
#sudo rpmbuild -ta courier-authlib-0.63.0.tar.bz2
sudo is not used by default on a red hat based distro
sudo is not set up by default on a red hat based distro
use " su " or "su -" on a red hat system
using rpmbuild on a untared tarbal
and on an uncompiled untared tarbal
and one that is 3 years OUT OF DATE
so what is it you want to do
i have NO IDEA what
if you NEED to build the source
DL the current 66.3
( double click on it and let fileroller extract it ( just like on MS windows-- no different)
then READ the files README and INSTALL
make 100% sure you DID install gcc and autotools
with the groupinstall
yum groupinstall "development Tools" "Development Libraries"
then run the configure script