Before you compile the program, you need to create users and groups that will be expected to be in place when the install script executes. Add the users and groups with the following commands: groupadd courier && useradd -c 'Courier Mail Server -d /dev/null -g courier -s /bin/false courier Install courier by running the following commands: ./configure ./configure --prefix=/usr --sysconfdir=/etc/courier --with-piddir=/var/run \ --libexecdir=/usr/sbin --datadir=/usr/share/courier \ --localstatedir=/var/lib/courier --disable-root-check --with-db=gdbm \ --with-mailuser=courier --withmailgroup=courier \ --enable-workarounds-for-imap-client-bugs \ --with-ispell=/usr/bin/aspell && make && make install && make install-configure