audio/nas broken on install

[Sean McNeil]

make works fine, but then make install does something funky:

install in include/audio done
installing in ./server...
making all in server/dia...
making all in server/os...
making all in server/dda/voxware...
rm -f auvoxware.o
cc -c -g -O -pipe      -I. -I../../include -I../../../include -I../../dia -I../../../include -I/usr/X11R6/include    -DCSRG_BASED  -DFUNCPROTO=15 -DNARROWPROTO      auvoxware.c
auvoxware.c:180:32: machine/pcaudioio.h: No such file or directory
*** Error code 1

Stop in /usr/ports/audio/nas/work/nas-1.7/server/dda/voxware.
*** Error code 1

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