source: dist/common/check_dependenties.pl

while(<STDIN>) {
        chomp;
        $app = $_;
        $path = `which $app 2>/dev/null`;
        $err = $?;
        print $app.": ";
        if($err != 0) {
                print "failed ($err)\n";
        }
        else {
                print $path;
        }
}