Created attachment 220484 [details] [review]
get WIFEXITED and WEXITSTATUS from sys/wait.h

Hi.

Linux has a definition for WIFEXITED and WEXITSTATUS in both stdlib.h
and sys/wait.h which is not the case on at least FreeBSD and OpenBSD.
The norm is to get them from sys/wait.h which should work on all Unices.

Otherwise on !linux, we end up with:
screen.o(.text+0x2a9f): In function `meta_screen_new':
: warning: sprintf() is often misused, please use snprintf()
delete.o(.text+0x462): In function `dialog_exited':
: undefined reference to `WIFEXITED'
delete.o(.text+0x485): In function `dialog_exited':
: undefined reference to `WEXITSTATUS'

Would that be alright to push?