http://www.tomo.gr.jp/FreeWnn/ftp.html を見て、
ftp://ftp.kddlabs.co.jp/Japan/pub/FreeWnn/ からFreeWnn-1.10.tar.gz をもらって来て
configure.in に次の修正をして

--- configure.in-ooo	Tue Apr  6 12:12:19 1999
+++ configure.in	Fri Jul 21 23:28:43 2000
@@ -72,6 +72,13 @@
         CPP=/usr/ccs/lib/cpp
     fi
     ;;
+"NetBSD")
+    CCOPTIONS="-DCSRG_BASED"
+    CDEBUGFLAGS="-O2 -fno-strength-reduce"
+    if test -x /usr/bin/cpp; then
+        CPP=/usr/bin/cpp
+    fi
+    ;;
 *)
     AC_MSG_ERROR("This system is not supported.")
     ;;

autoconf
./configure
(X 関係が全て no になるが、まあいいとして)
time make
(したけれど測れなかった) make install すると次のところに入る

root@harry  23:40:33/000721(/usr)# find . -cmin -10 -type d
./local/bin
./local/bin/Wnn4
./local/bin/cWnn4
./local/bin/kWnn4
./local/lib
./local/lib/wnn
./local/lib/wnn/ja_JP
 .... この部分かなり省略 ...
./X11R6/include
./X11R6/include/wnn
./X11R6/include/cwnn
./X11R6/include/kwnn
./X11R6/lib

次のようにして server を起動しておいて

root@harry  23:45:53/000721(/usr)# /usr/local/bin/Wnn4/jserver 

Nihongo Multi Client Server (4.20)
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/kihon.dic    Fid = 1
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/setsuji.dic  Fid = 2
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/koyuu.dic    Fid = 3
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/chimei.dic   Fid = 4
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/jinmei.dic   Fid = 5
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/special.dic  Fid = 6
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/computer.dic         Fid = 7
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/symbol.dic   Fid = 8
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/tankan.dic   Fid = 9
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/bio.dic      Fid = 10
Reading /usr/local/lib/wnn/ja_JP/dic/pubdic/full.fzk     Fid = 11
Finished Reading Files
root@harry  23:46:06/000721(/usr)# 

を見て、emacs の中から変換すると、うまく動く。この後は Emacs を作り直しかな。