interactive problem in build?

[Greg Troxel]

I rebuild packages in pkgsrc with pkg_rolling-replace (under NetBSD),
which does them one at a time in tsort'd dependency order.  I typically
do this by

# pkg_rolling-replace -uv &> RR.000 &

not redirecting stdin.

This works fine (module packages not building), except for guile.  With
guile (1.8 series has done this, not sure about earlier), the process
group stops due to "tty output".  Foregrounding the job for a few
seconds lets it continue.  So it seems there is something in the build
that tries to open the control tty associated with the process group.

I will try to debug this further, and find the sticking point, but I am
curious if anyone else has seen this?

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