patch for libpcap configure.in to handle future DAG API releases

[Jesper Peterson <jesper () endace com>]

Slight change in the way the DAG API availability is detected, add extra 
object if found and always report detected API version.

--
Jesper Peterson, Senior Software Developer
http://www.endace.com, +64 7 839 0540

Index: configure.in
===================================================================
RCS file: /tcpdump/master/libpcap/configure.in,v
retrieving revision 1.102
diff -u -r1.102 configure.in
--- configure.in        30 Nov 2003 22:42:25 -0000      1.102
+++ configure.in        9 Dec 2003 22:42:26 -0000
@@ -257,7 +257,7 @@
        # Use DAG API if present, otherwise don't
        #
        want_dag=ifpresent
-       dag_root=
+       dag_root=/root/dag
 ])
 ac_cv_lbl_dag_api=no
 case "$V_PCAP" in
@@ -297,17 +297,27 @@
                dag_include_dir="$dag_root"
        fi
 
-       if test -r "$dag_include_dir/dagapi.h" -a -r "$dag_tools_dir/dagapi.o"; then
-               V_INCLS="$V_INCLS -I $dag_include_dir"
+       ac_cv_lbl_dag_api=no
+       if test -r "$dag_include_dir/dagapi.h" -a -r "$dag_tools_dir/dagapi.o" -a -r "$dag_tools_dir/dagopts.o"; then
+               V_INCLS="$V_INCLS -I $dag_include_dir"
                V_LIBS="$V_LIBS $dag_tools_dir/dagapi.o $dag_tools_dir/dagopts.o"
                if test "$V_PCAP" != dag ; then
-                  SSRC="pcap-dag.c"
+                        SSRC="pcap-dag.c"
                fi
                ac_cv_lbl_dag_api=yes
-       else
-               ac_cv_lbl_dag_api=no
        fi
-       AC_MSG_RESULT($ac_cv_lbl_dag_api)
+       if test -r "$dag_root/lib/dagreg.c"; then # DAG 2.5.x
+               if test -r "$dag_tools_dir/dagreg.o"; then
+                       V_LIBS="$V_LIBS $dag_tools_dir/dagreg.o"
+               else
+                       ac_cv_lbl_dag_api=no
+               fi
+       fi
+       dag_version=
+       if test $ac_cv_lbl_dag_api = yes -a -r "$dag_root/VERSION"; then
+               dag_version=" (`cat $dag_root/VERSION`)"
+       fi
+       AC_MSG_RESULT($ac_cv_lbl_dag_api$dag_version)
        if test $ac_cv_lbl_dag_api = no; then
                if test "$want_dag" = yes; then
                        AC_MSG_ERROR(DAG API not found under directory $dag_root; use --without-dag)