during installation on ubuntu i followed these steps.

ubuntu@nagios-2015:~$ uname -a
Linux nagios-2015 3.13.0-48-generic #80-Ubuntu SMP Thu Mar 12 11:16:15 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

sudo wget http://downloads.sourceforge.net/project/nxlog-ce/nxlog-ce-2.8.1248.tar.gz
tar zxvf nxlog-ce-2.8.1248.tar.gz
cd nxlog-ce-2.8.1248/
aptitude install libpcre3-dev libapr1-dev libssl-dev libexpat-dev make
./configure
make
make install
mkdir -p /usr/local/var/run/nxlog/
mkdir /var/log/nxlog/
mkdir -p /usr/local/var/spool/nxlog/
mkdir /usr/local/etc/nxlog
useradd nxlog
cp /root/nxlog-ce-2.8.1248/packaging/debian/nxlog.init /etc/init.d/nxlog
sed -i 's/\/usr\/bin\/nxlog/\/usr\/local\/bin\/nxlog/g' /etc/init.d/nxlog
vim /usr/local/etc/nxlog/nxlog.conf
bash -x /etc/init.d/nxlog start

now i am seeing this error

2015-09-14 19:09:35 ERROR Failed to load module from /usr/local/libexec/nxlog/modules/extension/xm_perl.so, /usr/local/libexec/nxlog/modules/extension/xm_perl.so: cannot open shared object file: No such file or directory;DSO load failed
2015-09-14 19:09:35 ERROR Couldn't parse Exec block at /usr/local/etc/nxlog/nxlog.conf:88;couldn't parse statement at line 88, character 28 in /usr/local/etc/nxlog/nxlog.conf;module perl not found

How do i install that extension individually?