Flex-&flex-depversion; needs the following to be installed: Bash: sh Binutils: ar, as, ld, ranlib Bison: bison Diffutils: cmp Fileutils: chmod, cp, install, ln, mv, rm, touch Gcc: cc1, collect2, cpp0, gcc Grep: egrep, grep Make: make Sed: sed Sh-utils: echo, hostname Textutils: cat, tr