pkg/57678: Building pkgsrc/lang/python311 (and likely friends) hangs waiting for tty

[john%ziaspace.com@localhost]

	Note: There was a bad value `' for the field `Class'.
	It was set to the default value of `sw-bug'.

>Number:         57678
>Category:       pkg
>Synopsis:       Building pkgsrc/lang/python311 (and likely friends) hangs waiting for tty
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon Oct 30 18:40:00 +0000 2023
>Originator:     John Klos
>Release:        NetBSD 10.0_BETA
>Organization:
	
>Environment:
	
	
System: NetBSD anath.zia.io 10.0_BETA NetBSD 10.0_BETA (ANATH) #0: Thu Oct 12 15:46:39 UTC 2023 john%frigg.zia.io@localhost:/usr/obj-evbarm/sys/arch/evbarm/compile/ANATH evbarm
Architecture: aarch64
Machine: evbarm
>Description:
	
When building pkgsrc/lang/python311 with output sent to a file or backgrounded,
the build hangs waiting for tty:

anath# pkg_rolling-replace -suv >& /root/rolling.log &
[1] 24121
(a little while later)
anath# 
[1]  + Suspended (tty output)        pkg_rolling-replace -suv >& /root/rolling.log

>How-To-Repeat:
	
Run "make package &" in pkgsrc/lang/python311
Build hangs running:
/usr/bin/make DESTDIR=/usr/pkgsrc/lang/python311/work/.destdir -f Makefile altinstall
./python -E ./setup.py build
>Fix:
	

>Unformatted: