What are _p. files that break installworld?

[Carolyn Longfoot]

I have just run make buildworld on '4 stable' (4.9) and with make 
installworld I get a ton of missing files, such as libvgl_p.a /usr/lib, all 
follwing the same pattern where a .a file exists but the corresponding _p.a 
file in the same lib directory.

What's up with that and what are those pesky files?

Cheers,
Caro

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