diff -urN WordNet-3.0/configure.ac WordNet-3.0.new/configure.ac
--- WordNet-3.0/configure.ac	2007-01-20 20:59:24.000000000 +0100
+++ WordNet-3.0.new/configure.ac	2008-04-17 12:50:55.019676737 +0200
@@ -40,7 +40,7 @@
 fi
 AC_SUBST(ac_prefix)
 AH_TEMPLATE([DEFAULTPATH],[The default search path for WordNet data files])
-AC_DEFINE_UNQUOTED(DEFAULTPATH, ["$ac_prefix/dict"], [Default installation prefix.])
+AC_DEFINE_UNQUOTED(DEFAULTPATH, ["$datadir/WordNet/dict"], [Default installation prefix.])
 
 #AC_DEFINE_UNQUOTED(DEFAULTPATH,"${prefix}/dict")