+# check if we have multiple processors/cores
+n=$(nproc 2>/dev/null)
+if [ -z "$n" ]; then
+ n=$(grep ^processor /proc/cpuinfo 2>/dev/null | wc -l)
+ [ $n -eq 0 ] && n=1
+fi
+# If we are compiling with distcc, try to guess a reasonable number
+# based on (a) the number of cores on this machine and (b) the number
+# of words in the DISTCC_HOSTS variable.
+d="$(echo $DISTCC_HOSTS | wc -w)"
+n=$(($n + 2 * $n * $d))
+echo preparing, parallel=$n...