I ran into the same thing. As a quick workaround simply 

rm -rf $DESTDIR/usr/include

(fill in $DESTDIR as appropriate for your build)

James

>
>Here's what I get with the latest build.sh:
>
>#  $NetBSD: build.sh,v 1.12 2001/10/31 01:56:10 tv Exp $
>
>
>tel-aran-rhiod# ./build.sh -m i386 -T /raid0/tooldir -D /raid0/destdir
>...
>/u0/netbsd/src/lib/libc/yp/yperr_string.c:42: rpcsvc/yp_prot.h: No
>such file or directory
>/u0/netbsd/src/lib/libc/yp/yperr_string.c:43: rpcsvc/ypclnt.h: No such
>file or directory
>/u0/netbsd/src/lib/libc/yp/ypprot_err.c:41: rpcsvc/yp_prot.h: No such
>file or directory
>/u0/netbsd/src/lib/libc/yp/ypprot_err.c:42: rpcsvc/ypclnt.h: No such
>file or directory
>/raid0/tooldir/bin/mkdep: compile failed.
>*** Error code 1
>
>Stop.
>nbmake: stopped in /u0/netbsd/src/lib/libc
>*** Error code 1
>
>Stop.
>nbmake: stopped in /u0/netbsd/src/lib
>*** Error code 1
>
>Stop.
>nbmake: stopped in /u0/netbsd/src
>*** Error code 1
>
>Stop.
>nbmake: stopped in /u0/netbsd/src
>
>
>
>