Compilation step

Lower in the script you will find such lines :

# Three compilation modes are possible :
# full = full compilation (default value)
# incr = incremental compilation (from a starting to an ending level)
# off  = No compilation at all
# Choose compilation mode (full/incr/off) :
# ---------------------------------------
export ICS_ICFMODE=full

By default the source code in pack is scanned and all the files which should be compiled (because the corresponding object files are missing or older than the source files) will be compiled. You can skip the compilation step completely by setting export ICS_ICFMODE=off. Of course, doing this is unsecure because then your libraries or executables might be unstable. You should do this only to save time if you are absolutely sure that your compilation step is up to date.