--- nmap-4.04BETA1/configure.ac.orig	2006-05-16 05:20:32 +0000
+++ nmap-4.04BETA1/configure.ac	2006-06-01 21:12:47 +0000
@@ -490,12 +490,15 @@ AC_ARG_WITH(libdnet,
 [  --with-libdnet=DIR    Use an existing (compiled) dnet lib from DIR/include and DIR/lib.],
 [  case "$with_libdnet" in
   yes)
+    have_dnet=yes
     ;;
   included)
     ;;
   *)
-    CXXFLAGS="-I$with_libdnet/include $CXXFLAGS"
-    LDFLAGS="-L$with_libdnet/lib $LDFLAGS"
+    if test "$with_libdnet" != "/usr"; then
+      CXXFLAGS="-I$with_libdnet/include $CXXFLAGS"
+      LDFLAGS="-L$with_libdnet/lib $LDFLAGS"
+    fi
     have_dnet=yes
     ;;
   esac]