The package "ikarus", another programming language implementation, also requires SSE2 support. There is a check in the preinst script which aborts installation if sse2 is unavailable. case "$1" in install|upgrade) if egrep -q '^flags[[:space:]]*:.*\bsse2\b' /proc/cpuinfo; then # echo CPU instruction set extension sse2 confirmed true else echo "error: CPU flag sse2 not found, aborting installation" exit 1 fi ;; Cheers, --Barak.