I am trying to install smokeping but keep failing because of this error:

Can't locate BER.pm in @INC (@INC contains: /usr/local/smokeping/lib /usr/local/rrdtool-1.2.0/lib/perl/5.8.8/i486-linux-thread-multi /usr/local/rrdtool-1.2.0/lib/perl/5.8.8 /usr/local/rrdtool-1.2.0/lib/perl /usr/lib/perl5/5.8.8/i486-linux-thread-multi /usr/lib/perl5/5.8.8 /usr/lib/perl5/site_perl/5.8.8/i486-linux-thread-multi /usr/lib/perl5/site_perl/5.8.8 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.8/i486-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.8 /usr/lib/perl5/vendor_perl .) at /usr/local/smokeping/lib/SNMP_util.pm line 40.
BEGIN failed--compilation aborted at /usr/local/smokeping/lib/SNMP_util.pm line 40.
Compilation failed in require at /usr/local/smokeping/lib/Smokeping.pm line 9.
BEGIN failed--compilation aborted at /usr/local/smokeping/lib/Smokeping.pm line 9.
Compilation failed in require at ./smokeping line 7.
BEGIN failed--compilation aborted at ./smokeping line 7.

Help would be great

looks like you don't have BER.pm installed. It's a perl module.

You could install with CPAN (as root)
Be prepared to answer a few questions if you have never run CPAN before.

or you might grab and install it manually from here http://search.cpan.org/src/GBARR/Convert-BER-1.3101/ but you may or may not need to satisfy some dependencies with this method.

SmokePing will likely list the required Perl modules and any other dependencies in the README/INSTALL files so probably best to read those first.

I did that and still getting the same errors.

I also install the rrdtool since that is what smokeping need and still that app won't work