Patch by Steve Kemp <skx@debian.org> for dsniff >= 2.4b1, which fixes the
compiling under AMD64 respectively x86_64. For further information, please
have a look to Debian bug ID #254002.

--- dsniff-2.4b1/configure		2005-06-23 03:30:37.000000000 +0000
+++ dsniff-2.4b1/configure.amd64_fix	2005-06-23 04:15:59.000000000 +0000
@@ -2667,15 +2667,62 @@
   echo "$ac_t""no" 1>&6
 fi
 
+echo $ac_n "checking for __dn_expand in -lresolv""... $ac_c" 1>&6
+echo "configure:2672: checking for __dn_expand in -lresolv" >&5
+ac_lib_var=`echo resolv'_'__dn_expand | sed 'y%./+-%__p_%'`
+if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
+  echo $ac_n "(cached) $ac_c" 1>&6
+else
+  ac_save_LIBS="$LIBS"
+LIBS="-lresolv  $LIBS"
+cat > conftest.$ac_ext <<EOF
+#line 2680 "configure"
+#include "confdefs.h"
+/* Override any gcc2 internal prototype to avoid an error.  */
+/* We use char because int might match the return type of a gcc2
+    builtin and then its argument prototype would still apply.  */
+char __dn_expand();
+
+int main() {
+__dn_expand()
+; return 0; }
+EOF
+if { (eval echo configure:2691: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+  rm -rf conftest*
+  eval "ac_cv_lib_$ac_lib_var=yes"
+else
+  echo "configure: failed program was:" >&5
+  cat conftest.$ac_ext >&5
+  rm -rf conftest*
+  eval "ac_cv_lib_$ac_lib_var=no"
+fi
+rm -f conftest*
+LIBS="$ac_save_LIBS"
+
+fi
+if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
+  echo "$ac_t""yes" 1>&6
+    ac_tr_lib=HAVE_LIB`echo resolv | sed -e 's/[^a-zA-Z0-9_]/_/g' \
+    -e 'y/abcdefghijklmnopqrstuvwxyz/ABCDEFGHIJKLMNOPQRSTUVWXYZ/'`
+  cat >> confdefs.h <<EOF
+#define $ac_tr_lib 1
+EOF
+
+  LIBS="-lresolv $LIBS"
+
+else
+  echo "$ac_t""no" 1>&6
+fi
+
 for ac_func in dirname strlcpy strlcat strsep
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2674: checking for $ac_func" >&5
+echo "configure:2721: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2679 "configure"
+#line 2726 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2698,7 +2745,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2702: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2749: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -2728,12 +2775,12 @@
 for ac_func in MD5Update
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2732: checking for $ac_func" >&5
+echo "configure:2779: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2737 "configure"
+#line 2784 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2756,7 +2803,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2760: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2807: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -2788,12 +2835,12 @@
 for ac_func in warnx
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2792: checking for $ac_func" >&5
+echo "configure:2839: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2797 "configure"
+#line 2844 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2816,7 +2863,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2820: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2867: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -2848,12 +2895,12 @@
 for ac_func in ether_ntoa
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:2852: checking for $ac_func" >&5
+echo "configure:2899: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 2857 "configure"
+#line 2904 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -2876,7 +2923,7 @@
 
 ; return 0; }
 EOF
-if { (eval echo configure:2880: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:2927: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -2912,7 +2959,7 @@
 fi
 
 echo $ac_n "checking for Berkeley DB with 1.85 compatibility""... $ac_c" 1>&6
-echo "configure:2916: checking for Berkeley DB with 1.85 compatibility" >&5
+echo "configure:2963: checking for Berkeley DB with 1.85 compatibility" >&5
 # Check whether --with-db or --without-db was given.
 if test "${with_db+set}" = set; then
   withval="$with_db"
@@ -3015,7 +3062,7 @@
 
 
 echo $ac_n "checking for libpcap""... $ac_c" 1>&6
-echo "configure:3019: checking for libpcap" >&5
+echo "configure:3066: checking for libpcap" >&5
 # Check whether --with-libpcap or --without-libpcap was given.
 if test "${with_libpcap+set}" = set; then
   withval="$with_libpcap"
@@ -3063,7 +3110,7 @@
 
 
 echo $ac_n "checking for libnet""... $ac_c" 1>&6
-echo "configure:3067: checking for libnet" >&5
+echo "configure:3114: checking for libnet" >&5
 # Check whether --with-libnet or --without-libnet was given.
 if test "${with_libnet+set}" = set; then
   withval="$with_libnet"
@@ -3110,7 +3157,7 @@
 
 
 echo $ac_n "checking for libnids""... $ac_c" 1>&6
-echo "configure:3114: checking for libnids" >&5
+echo "configure:3161: checking for libnids" >&5
 # Check whether --with-libnids or --without-libnids was given.
 if test "${with_libnids+set}" = set; then
   withval="$with_libnids"
@@ -3152,9 +3199,9 @@
 save_cppflags="$CPPFLAGS"
 CPPFLAGS="$NIDSINC"
 echo $ac_n "checking whether libnids version is good""... $ac_c" 1>&6
-echo "configure:3156: checking whether libnids version is good" >&5
+echo "configure:3203: checking whether libnids version is good" >&5
 cat > conftest.$ac_ext <<EOF
-#line 3158 "configure"
+#line 3205 "configure"
 #include "confdefs.h"
 #include <nids.h>
 EOF
@@ -3173,7 +3220,7 @@
 
 
 echo $ac_n "checking for OpenSSL""... $ac_c" 1>&6
-echo "configure:3177: checking for OpenSSL" >&5
+echo "configure:3224: checking for OpenSSL" >&5
 # Check whether --with-openssl or --without-openssl was given.
 if test "${with_openssl+set}" = set; then
   withval="$with_openssl"
--- dsniff-2.4b1/configure.in		2005-06-23 03:30:37.000000000 +0000
+++ dsniff-2.4b1/configure.in.amd64_fix	2005-06-23 04:16:01.000000000 +0000
@@ -57,6 +57,7 @@
 AC_CHECK_LIB(nsl, gethostbyname)
 dnl XXX - feh, everything except OpenBSD sux.
 AC_CHECK_LIB(resolv, dn_expand)
+AC_CHECK_LIB(resolv, __dn_expand)
 AC_REPLACE_FUNCS(dirname strlcpy strlcat strsep)
 needmd5=no
 AC_CHECK_FUNCS(MD5Update, , [needmd5=yes])