raise Utils.WafError("Command %s exited with code %i" % (argv, retval))

        signame = None

        if retval < 0: # signal?

            import signal

            for name, val in vars(signal).iteritems():

                if len(name) > 3 and name[:3] == 'SIG' and name[3] != '_':

                    if val == -retval:

                        signame = name

                        break

        if signame:

            raise Utils.WafError("Command %s terminated with signal %s."

                                 " Run it under a debugger to get more information "

                                 "(./waf --run <program> --command-template=\"gdb --args %%s <args>\")." % (argv, signame))

        else:

            raise Utils.WafError("Command %s exited with code %i" % (argv, retval))