execvp (*mb_argv, mb_argv);
+ fprintf(stderr, "execvp(");
+ for ( char **ppc = mb_argv; *ppc; ppc++ )
+ fprintf(stderr, "%s%s", ppc == mb_argv ? "" : ", ", *ppc);
+ fprintf(stderr, ") failed with error %d!\n", errno);
+
// there is no return after successful exec()
_exit(-1);