[root@PAUMAKA /usr/ports/audio/nas]# make install clean
===>  Building for nas-1.8
making all in ./include...
making all in include/audio...
making all in ./server...
making all in server/dia...
rm -f dispatch.o
cc -c -O2 -fno-strict-aliasing -pipe       -I. -I../include -I../../include -I../../lib/audio -I../../include -I/usr/X11R6/include    -DCSRG_BASED  -DFUNCPROTO=15 -DNARROWPROTO   -DNASCONFSEARCHPATH=\"/usr/X11R6/etc/\"   dispatch.c
In file included from ../include/resource.h:27,
                 from ../include/dixstruct.h:31,
                 from dispatch.c:52:
../include/misc.h:36:25: X11/Xosdefs.h: No such file or directory
../include/misc.h:62:57: X11/Xfuncs.h: No such file or directory
*** Error code 1

Stop in /usr/ports/audio/nas/work/nas-1.8/server/dia.
*** Error code 1

Stop in /usr/ports/audio/nas/work/nas-1.8/server.
*** Error code 1

Stop in /usr/ports/audio/nas/work/nas-1.8.
*** Error code 1

Stop in /usr/ports/audio/nas.