install/47973: build uses <sys/signal.h> not in POSIX

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>Number:         47973
>Category:       install
>Synopsis:       build uses <sys/signal.h> not in POSIX
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    install-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Jun 29 11:35:00 +0000 2013
>Originator:     Justin Cormack
>Release:        6.1
>Organization:
>Environment:
Linux brill 3.8.0-25-generic #37-Ubuntu SMP Thu Jun 6 20:47:07 UTC 2013 x86_64 
GNU/Linux
Note this is a build on Linux with Musl libc not glibc
>Description:
During NetBSD build it fails with:
usr/src/usr.bin/make/main.c:120:24: fatal error: sys/signal.h: No such file or 
directory

<sys/signal.h> is not defined in POSIX, should use #include <signal.h> instead.

>How-To-Repeat:
Perform NetBSD build on a POSIX system that does not happen to have a 
<sys/signal.h> file defined.

>Fix:
Replace this with #include <signal.h>; this should define the same things.