config.h.in, configure, configure.ac:

Add configure support for ANSI arrow keys.
        Tested OK with gnome-terminal.

src/complete.c:
	Remove usage of CONST and refactor compare() to use standard
        C syntax instead of old K&R.

configure

@@ -1286,6 +1286,7 @@ Optional Features:
   --disable-dependency-tracking  speeds up one-time build
   --enable-dependency-tracking   do not reject slow dependency extractors
   --enable-default-complete      Enable default completion handler.
+  --enable-arrow-keys            Enable ANSI arrow keys.
 
 Some influential environment variables:
   CC          C compiler command
@@ -5003,6 +5004,23 @@ else
 fi
 
 
+ac_enable_arrow_keys=no
+# Check whether --enable-arrow-keys was given.
+if test "${enable_arrow_keys+set}" = set; then
+  enableval=$enable_arrow_keys;  ac_enable_arrow_keys=$enableval
+else
+   ac_enable_arrow_keys=no
+fi
+
+
+if test "x${ac_enable_arrow_keys}" = xyes ; then
+
+cat >>confdefs.h <<\_ACEOF
+#define ANSI_ARROWS
+_ACEOF
+
+fi
+
 ac_config_files="$ac_config_files Makefile src/Makefile include/Makefile man/Makefile examples/Makefile"
 
 cat >confcache <<\_ACEOF
@@ -6342,3 +6360,4 @@ if test "$no_create" != yes; then
   $ac_cs_success || { (exit 1); exit 1; }
 fi
 
+