diff -ur kismet-2007-01-R1b/config.h.in temp/config.h.in
--- kismet-2007-01-R1b/config.h.in	2006-10-13 16:50:32.000000000 -0400
+++ temp/config.h.in	2007-01-17 10:02:43.000000000 -0500
@@ -60,6 +60,9 @@
 /* Libz compression lib */
 #undef HAVE_LIBZ
 
+/* Linux wireless iwfreq.flag */
+#undef HAVE_LINUX_IWFREQFLAG
+
 /* Linux netlink socket capture present */
 #undef HAVE_LINUX_NETLINK
 
diff -ur kismet-2007-01-R1b/configure temp/configure
--- kismet-2007-01-R1b/configure	2006-12-27 09:32:52.000000000 -0500
+++ temp/configure	2007-01-17 10:02:43.000000000 -0500
@@ -7795,6 +7795,92 @@
 
 		fi
 
+		iwfreqflag=no
+		{ echo "$as_me:$LINENO: checking can we use iw_freq.flags" >&5
+echo $ECHO_N "checking can we use iw_freq.flags... $ECHO_C" >&6; }
+		cat >conftest.$ac_ext <<_ACEOF
+/* confdefs.h.  */
+_ACEOF
+cat confdefs.h >>conftest.$ac_ext
+cat >>conftest.$ac_ext <<_ACEOF
+/* end confdefs.h.  */
+
+			#include <stdio.h>
+			#include <sys/types.h>
+			#include <netinet/in.h>
+			#include <asm/types.h>
+			#include <linux/if.h>
+			#include <linux/wireless.h>
+
+int
+main ()
+{
+
+			struct iwreq wrq;
+			wrq.u.freq.flags = IW_FREQ_FIXED;
+
+  ;
+  return 0;
+}
+_ACEOF
+rm -f conftest.$ac_objext conftest$ac_exeext
+if { (ac_try="$ac_link"
+case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_link") 2>conftest.er1
+  ac_status=$?
+  grep -v '^ *+' conftest.er1 >conftest.err
+  rm -f conftest.er1
+  cat conftest.err >&5
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); } &&
+	 { ac_try='test -z "$ac_c_werror_flag" || test ! -s conftest.err'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; } &&
+	 { ac_try='test -s conftest$ac_exeext'
+  { (case "(($ac_try" in
+  *\"* | *\`* | *\\*) ac_try_echo=\$ac_try;;
+  *) ac_try_echo=$ac_try;;
+esac
+eval "echo \"\$as_me:$LINENO: $ac_try_echo\"") >&5
+  (eval "$ac_try") 2>&5
+  ac_status=$?
+  echo "$as_me:$LINENO: \$? = $ac_status" >&5
+  (exit $ac_status); }; }; then
+  iwfreqflag=yes
+else
+  echo "$as_me: failed program was:" >&5
+sed 's/^/| /' conftest.$ac_ext >&5
+
+	iwfreqflag=no
+fi
+
+rm -f core conftest.err conftest.$ac_objext \
+      conftest$ac_exeext conftest.$ac_ext
+
+		if test "$iwfreqflag" = "no"; then
+			{ echo "$as_me:$LINENO: result: no" >&5
+echo "${ECHO_T}no" >&6; }
+		else
+			{ echo "$as_me:$LINENO: result: yes" >&5
+echo "${ECHO_T}yes" >&6; }
+
+cat >>confdefs.h <<\_ACEOF
+#define HAVE_LINUX_IWFREQFLAG 1
+_ACEOF
+
+		fi
+
 	fi
 fi
 
diff -ur kismet-2007-01-R1b/configure.in temp/configure.in
--- kismet-2007-01-R1b/configure.in	2006-12-27 09:32:52.000000000 -0500
+++ temp/configure.in	2007-01-17 10:02:43.000000000 -0500
@@ -438,6 +438,27 @@
 			AC_DEFINE(HAVE_LINUX_WIRELESS22, 1, [Linux wireless extentions v22 or better present])
 		fi
 
+		iwfreqflag=no
+		AC_MSG_CHECKING(can we use iw_freq.flags)
+		AC_LINK_IFELSE([AC_LANG_PROGRAM([[
+			#include <stdio.h>
+			#include <sys/types.h>
+			#include <netinet/in.h>
+			#include <asm/types.h>
+			#include <linux/if.h>
+			#include <linux/wireless.h>
+		]], [[
+			struct iwreq wrq;
+			wrq.u.freq.flags = IW_FREQ_FIXED;
+		]])],[iwfreqflag=yes],[iwfreqflag=no])
+
+		if test "$iwfreqflag" = "no"; then
+			AC_MSG_RESULT(no)
+		else
+			AC_MSG_RESULT(yes)
+			AC_DEFINE(HAVE_LINUX_IWFREQFLAG, 1, [Linux wireless iwfreq.flag])
+		fi
+
 	fi
 fi
 
diff -ur kismet-2007-01-R1b/iwcontrol.cc temp/iwcontrol.cc
--- kismet-2007-01-R1b/iwcontrol.cc	2006-11-17 11:13:23.000000000 -0500
+++ temp/iwcontrol.cc	2007-01-17 10:02:43.000000000 -0500
@@ -519,7 +519,9 @@
     memset(&wrq, 0, sizeof(struct iwreq));
 
     strncpy(wrq.ifr_name, in_dev, IFNAMSIZ);
+#ifdef HAVE_LINUX_IWFREQFLAG
 	wrq.u.freq.flags = IW_FREQ_FIXED;
+#endif
     IwFloat2Freq(in_ch, &wrq.u.freq);
 
     // Try twice with a tiny delay, some cards (madwifi) need a second chance...