On 8/22/21 4:19 AM, Evan Miller wrote:
> c-stack.c: In function 'die':
> c-stack.c:106:17: warning: implicit declaration of function 'mempcpy' [-Wimplicit-function-declaration]
>         char *p = mempcpy (buf, progname, prognamelen);

Evidently some dependencies were missing from the c-stack module. I 
installed the attached patch. Please try the same set of commands again.