freebsd7安装ies4linux2.99的问题

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粗线如下错误提示
IEs4Linux will:
- Install Internet Explorers: 6.0
- Using IE locale: EN-US
- Install Adobe Flash 9.0
- Install everything at: /root/.ies4linux
[ OK ]

Downloading everything we need
Downloading from microsoft.com:
0% DCOM98.EXE/root/ies4linux-2.99.0/lib/install.sh: line 17: pidof: command not found
ps: option requires an argument -- p
usage: ps [-aCcefHhjlmrSTuvwXxZ] [-O fmt | -o fmt] [-G gid[,gid...]]
[-M core] [-N system]
[-p pid[,pid...]] [-t tty[,tty...]] [-U user[,user...]]
ps [-L]
/root/ies4linux-2.99.0/lib/install.sh: line 39: [: 0 /root/.ies4linux/downloads/DCOM98.EXE: integer expression expected
100% DCOM98.EXE
An error ocurred when downloading. Please run IEs4Linux again. Corrupted file: DCOM98.EXE