Patch by Robert Scheck <robert@fedoraproject.org> for iftop >= 0.17, which works

around a PuTTY issue (doesn't honor vt100 line-drawing when in UTF-8 mode) to get
sane lines drawn instead of letters. When using PuTTY in UTF-8 mode, you have to
execute "NCURSES_NO_UTF8_ACS=1 iftop" in the future. Technically, relinking from
curses to ncursesw is just half of the solution, calling setlocale() is the rest.
For further information, please have a look to Red Hat Bugzilla, bug ID #546032:
https://bugzilla.redhat.com/show_bug.cgi?id=546032

configure.in

@@ -352,7 +352,7 @@ dnl
 
 AC_MSG_CHECKING([for a curses library containing mvchgat])
 oldLIBS=$LIBS
-for curseslib in curses ncurses ; do
+for curseslib in ncursesw curses ncurses ; do
     LIBS="$oldLIBS -l$curseslib"
     AC_TRY_LINK([
 #include <curses.h>

iftop.c

@@ -27,6 +27,7 @@
 #include <signal.h>
 #include <string.h>
 #include <unistd.h>
+#include <locale.h>
 
 #include "iftop.h"
 #include "addr_hash.h"
@@ -763,6 +764,8 @@ int main(int argc, char **argv) {
     pthread_t thread;
     struct sigaction sa = {};
 
+    setlocale(LC_ALL, "");
+
     /* TODO: tidy this up */
     /* read command line options and config file */   
     config_init();