--- /dev/null
+#!/bin/sh
+set -e
+make=`type gmake >/dev/null 2>&1 && echo gmake || echo make`
+if [ $# = 0 ]; then
+ ncpus=`
+ perl -e 'use Sys::CPU; print Sys::CPU::cpu_count()' \
+ 2>/dev/null \
+ || echo 1
+ `
+ set -- -j$(( $ncpus * 2 ))
+fi
+x () {
+ echo >&2 "$*"
+ "$@"
+}
+x $make -C tests "$@"
+echo all ok.