With BUILD=1 and UPDATE=1, a make install from (the equivalent of)
/usr/src gets me:

install ===> usr.bin/audio
install ===> usr.bin/audio/common
install ===> usr.bin/audio/ctl
cc -O2 -g -Wall -Wstrict-prototypes -Wmissing-prototypes -Wpointer-arith -Werror   -I/vol1/rhialto/sup/root/src/usr.bin/audio/ctl/../common -nostdinc -idirafter /vol1/rhialto/destdir.vax/usr/include -c /vol1/rhialto/sup/root/src/usr.bin/audio/ctl/ctl.c
cc   -o audioctl -nostdlib -L/vol1/rhialto/destdir.vax/usr/lib /vol1/rhialto/destdir.vax/usr/lib/crt0.o  ctl.o -L/vol1/rhialto/sup/root/src/usr.bin/audio/common/obj.vax -laudio -lgcc -lc -lgcc
ld: -laudio: no match
collect2: ld returned 1 exit status
*** Error code 1 (continuing)

It seems that, because the libaudio.a file is not for general installation,
it is not made. It is, however required by the next few steps, audioctl,
audioplay and audiorecord.

I built the same sources on my alpha, but did a separate make build step
before make install, and there it seemed to work ok.

(-current supped on 24 february)

-Olaf.
--
___ Olaf 'Rhialto' Seibert - rhialto@polder.ubc.     -- If one tells the truth,
\X/ .kun.nl     -- one is sure, sooner or later, to be found out. (Oscar Wilde)