Installed mytop on a CentOS 6.2 box and ran into a bug.
The fix was simple. Comment out the problem line in the perl file.
[root@dbserver local]# mytop
Error in option spec: "long|!"
[root@dbserver local]# which mytop
/usr/bin/mytop
[root@dbserver local]# vi /usr/bin/mytop
From
"long|!" => \$config{long_nums},
To
# "long|!" => \$config{long_nums},