i386, current pkgsrc-current, it breaks like this:

===> Required package nas>=1.4.2: NOT found
===> Verifying reinstall for ../../audio/nas
===> Checking for vulnerabilities in nas-1.6nb3
=> Checksum OK for nas-1.6.src.tar.gz.
===> Extracting for nas-1.6nb3
===> Required installed package p5-perl-headers-1.6ZK: p5-perl-headers-1.6ZK found
===> Required installed package x11-links>=0.23: x11-links-0.23 found
===> Required installed package gmake>=3.78: gmake-3.80nb2 found
===> Patching for nas-1.6nb3
===> Applying pkgsrc patches for nas-1.6nb3
===> Overriding tools for nas-1.6nb3
===> Buildlinking for nas-1.6nb3
===> Configuring for nas-1.6nb3
mv -f Makefile Makefile.bak
imake -DUseInstalled -I/usr/X11R6/lib/X11/config
Imakefile.c:15: Imake.tmpl: No such file or directory
imake: Exit code 1.
  Stop.
*** Error code 1

-- 
/* Tomasz Luchowski <tomasz@luchowski.com> */