I'm very new to this OS and I'm having issues installing ISPConfig Here is the error that I'm getting once the install starts. ########## lex ########## which: no lex in (/sbin:/usr/sbin:/usr/local/sbin:/root/bin:/usr/local/bin:/bin:/usr/bin:/usr/X11R6/bin:/usr/local/libexec) ERROR: flex not found! Does anyone know how to fix this? I followed the detailed instructions from The Perfect Setup for CentOS 4.4 from howtoforge.com