yum install pam-devel -y
cd /usr/local
wget -O imap-2007f.tar.gz http://files.directadmin.com/services/all/imap/imap-2007f.tar.gz
tar xvf imap-2007f.tar.gz
cd imap-2007f
make lr5 EXTRACFLAGS=-fPIC
mkdir lib
mkdir include
cp c-client/*.c lib/
cp c-client/*.h include/
cp c-client/c-client.a lib/libc-client.a

This compilation application for multiphp, PHP1 & PHP2 installed with fastcgi

cd /usr/local/directadmin/custombuild
mkdir -p custom/fastcgi
cp configure/fastcgi/configure.php53 custom/fastcgi/
cp configure/fastcgi/configure.php56 custom/fastcgi/
perl -pi -e 's#--with-openssl \\#--with-openssl --with-imap=/usr/local/imap-2007f --with-imap-ssl \\#' custom/fastcgi/configure.php53
perl -pi -e 's#"--with-openssl" \\#"--with-openssl" "--with-imap=/usr/local/imap-2007f" "--with-imap-ssl" \\#' custom/fastcgi/configure.php53
perl -pi -e 's#--with-openssl \\#--with-openssl --with-imap=/usr/local/imap-2007f --with-imap-ssl \\#' custom/fastcgi/configure.php56
perl -pi -e 's#"--with-openssl" \\#"--with-openssl" "--with-imap=/usr/local/imap-2007f" "--with-imap-ssl" \\#' custom/fastcgi/configure.php56

./build php n