Add SSH_BIN compile-time option

Clarify documentation of internal netconf message struct

configure

@@ -623,6 +623,7 @@ ac_subst_vars='LTLIBOBJS
 LIBOBJS
 EGREP
 GREP
+SSH_BIN
 LEXLIB
 LEX_OUTPUT_ROOT
 LEX
@@ -4563,6 +4564,53 @@ if test "$LEX" = ":"; then
    as_fn_error $? "CLIXON does not find lex or flex." "$LINENO" 5
 fi
 
+# SSH binary path
+# Extract the first word of "ssh", so it can be a program name with args.
+set dummy ssh; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_SSH_BIN+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $SSH_BIN in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_SSH_BIN="$SSH_BIN" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_SSH_BIN="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+SSH_BIN=$ac_cv_path_SSH_BIN
+if test -n "$SSH_BIN"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $SSH_BIN" >&5
+$as_echo "$SSH_BIN" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
+
+cat >>confdefs.h <<_ACEOF
+#define SSH_BIN $SSH_BIN
+_ACEOF
+
+
 # Get "bison" from bison -y or other string
 if test "$YACC" = "${YACC##bison}" ; then
    as_fn_error $? "CLIXON does not find bison.  There are several problems with yacc and byacc. Please install bison. YACC=\"$YACC\"" "$LINENO" 5