I had this exact problem with a fresh install of Ubuntu 6.06.1 server and zcs-4.0.2_GA_362.UBUNTU6.tgz. Getopt::Std died with the Can't locate Getopt/Std.pm in @INC error.
Although the Ubuntu default install had perl running (This is perl, v5.8.7 built for i486-linux-gnu-thread-multi), Std.pm didn't exist on my system anywhere.
I ran apt-get install perl and got this:
Now there exists: ./usr/share/perl/5.8.7/Getopt/Std.pm
The following extra packages will be installed:
Re ran zcs ./install.sh and got past that point. Still not finished with the install, but I have moved beyond that error.