Can one disable tap-to-click in X server configuration without "InputClass" sections?

I want to configure my system so that tap-to-click is disabled on the touchpad. (It's running a rather old version of ALTLinux distro with xorg-server-1.4.2-alt10.M41.1.) I'm interested in a solution without running synclient in each X session. Probably, my X server is too old so that it doesn't understand "InputClass" sections in xorg.conf, as [suggested in another answer by Vincent Nivoliers](https://unix.stackexchange.com/a/70435/4319) : Section "InputClass" Identifier "touchpad catchall" Driver "synaptics" MatchIsTouchpad "on" MatchDevicePath "/dev/input/event*" Option "MaxTapTime" "0" EndSection The I get an error; from Xorg.*.log: (==) Using config file: "/etc/X11/xorg.conf" Parse error on line 71 of section InputClass in file /etc/X11/xorg.conf "InputClass" is not a valid section name. (EE) Problem parsing the config file (EE) Error parsing the config file Also, my xorg.conf doesn't have any explicit "InputDevice" sections (with a comment: "With libXiconfig we don't need configuration for ps and usb mice."). How do I put the "MaxTapTime" option into my xorg.conf so that the configuration of my input devices (including the touchpad) is not broken? (If I write explicit "InputDevice" sections, I might break the correct configuration obtained automatically..) Perhaps, the output of xinput list can be of some use. I do not want to make the question too specific by posting my xinput list and asking what to do in this specific case. Let it be just an example: $ xinput list "Virtual core keyboard" id=0 [XKeyboard] Num_keys is 248 Min_keycode is 8 Max_keycode is 255 "Virtual core pointer" id=1 [XPointer] Num_buttons is 32 Num_axes is 2 Mode is Relative Motion_buffer is 256 Axis 0 : Min_value is 0 Max_value is -1 Resolution is 0 Axis 1 : Min_value is 0 Max_value is -1 Resolution is 0 "AT Translated Set 2 keyboard" id=4 [XExtensionKeyboard] Type is KEYBOARD Num_keys is 248 Min_keycode is 8 Max_keycode is 255 "PS/2 Mouse" id=3 [XExtensionPointer] Type is MOUSE Num_buttons is 32 Num_axes is 2 Mode is Relative Motion_buffer is 256 Axis 0 : Min_value is -1 Max_value is -1 Resolution is 1 Axis 1 : Min_value is -1 Max_value is -1 Resolution is 1 "AlpsPS/2 ALPS GlidePoint" id=2 [XExtensionPointer] Type is TOUCHPAD Num_buttons is 12 Num_axes is 2 Mode is Relative Motion_buffer is 256 Axis 0 : Min_value is 0 Max_value is -1 Resolution is 1 Axis 1 : Min_value is 0 Max_value is -1 Resolution is 1 $ I expect the answer to give some general advice, not specific for this case.