argp-help.c:1343: warning: implicit declaration of function `alloca'
argp-help.c:1739:4: warning: #warning No reasonable value to return
argp-parse.c:1232: warning: implicit declaration of function `alloca'
mempcpy.c:14: warning: no previous prototype for `mempcpy'
strndup.c:15: warning: no previous prototype for `strndup'
strchrnul.c:15: warning: no previous prototype for `strchrnul'