Configured for `powerpc--netbsd'.

  Where should the build process find the source code?    
                              /export/pkgsrc/mef/emacs/work/emacs-21.1
  What operating system and machine description files should Emacs use?
        `s/netbsd.h' and `m/macppc.h'
  What compiler should emacs be built with?               cc -O
  Should Emacs use the GNU version of malloc?             yes
  Should Emacs use a relocating allocator for buffers?    yes
  Should Emacs use mmap(2) for buffer allocation?         no
  What window system should Emacs use?                    x11
  What toolkit should Emacs use?                          LUCID
  Where do we find X Windows header files?         /usr/X11R6/include
  Where do we find X Windows libraries?   
                   /usr/pkg/lib:/usr/X11R6/lib:/usr/local/lib:/usr/lib
  Does Emacs use -lXaw3d?                                 yes
  Does Emacs use -lXpm?                                   yes
  Does Emacs use -ljpeg?                                  yes
  Does Emacs use -ltiff?                                  yes
  Does Emacs use -lungif?                                 yes
  Does Emacs use -lpng?                                   yes
  Does Emacs use X toolkit scroll bars?                   yes

updating cache ./config.cache

powerpc-apple-netbsd とならないで powerpc--netbsd となってしまうのが気に食わないが。 ../../mk/bsd.prefs.mk:

MACHINE_GNU_PLATFORM?=    ${LOWER_ARCH}-${LOWER_VENDOR}-${LOWER_OPSYS}

が問題。

install: stripping /usr/pkg/libexec/emacs/21.1/powerpc--netbsd/rcs2log: No such file or directory

そうだ、こういう問題があった。
きっと余計な ./configure でもしてくれているのかと、./configure にトロイの木馬を仕込み

makoto@u ■13:33:27/011022(...work/emacs-21.1)> cat configure
echo $0 $*

何をしているか見て、 mk/bsd.prefs.mk を一か所 hardcode してしまって

@@ -87,7 +87,7 @@
 
 MAKEFLAGS+=            LOWER_OPSYS=${LOWER_OPSYS}
 
-LOWER_VENDOR?=
+LOWER_VENDOR?=apple
 LOWER_ARCH?=           ${MACHINE_GNU_ARCH}
 
 MACHINE_PLATFORM?=     ${OPSYS}-${OS_VERSION}-${MACHINE_ARCH}

から代りに手で同じことをして見たけれど、

./configure 
--x-libraries=/usr/pkg/lib:/usr/X11R6/lib:/usr/local/lib:/usr/lib 
--host=powerpc-apple-netbsd 
--prefix=/usr/pkg

何の問題もなく make; make install 出来てしまった。
という訳で、この辺から 21.1

emacs-version
"21.1.3"

(emacs-version)
"GNU Emacs 21.1.3 
(powerpc-apple-netbsd, X toolkit, Xaw3d scroll bars)
 of 2001-10-22 on u"

./emacs -q -batch -f list-load-path-shadows
This site has duplicate Lisp libraries with the same name. If a locally-installed Lisp library overrides a library in the Emacs release, that can cause trouble, and you should probably remove the locally-installed version unless you know what you are doing.
/usr/local/share/emacs/site-lisp/flim-1.14.2/md5 hides /usr/local/share/emacs/site-lisp/w3-200107/md5
/usr/local/share/emacs/site-lisp/flim-1.14.2/smtpmail hides /export/pkgsrc/mef/emacs/work/emacs-21.1/lisp/mail/smtpmail
/usr/local/share/emacs/site-lisp/wl-cvs-20011015/utf7 hides /export/pkgsrc/mef/emacs/work/emacs-21.1/lisp/gnus/utf7
219.387u 17.438s 4:21.23 90.6% 0+0k 5+2087io 950pf+0w
-prefix=/usr/pkg を付けるのを忘れてしまった。