The version in the SlackBuild is too old.
You also need a file with udev rules.
#!/bin/bash
#script
wget
http://prdownloads.sourceforge.net/l....8.4-3.tar.bz2
tar vxf linuxwacom*
cd linuxwacom*
configure --prefix=/usr --enable-wacomdrv --enable-wacom && make && make install
## End of File
Copy this next file to /etc/udev/rules.d/
Name it 60-wacom.rules
#/etc/udev/rules.d/60-wacom.rules
# udev rules for wacom tablets.
KERNEL!="event[0-9]*", GOTO="wacom_end"
# Multiple interface support for stylus and touch devices.
DRIVERS=="wacom", ATTRS{bInterfaceNumber}=="00", ENV{WACOM_TYPE}="stylus"
DRIVERS=="wacom", ATTRS{bInterfaceNumber}=="01", ENV{WACOM_TYPE}="touch"
# Convenience links for the common case of a single tablet. We could do just this:
#ATTRS{idVendor}=="056a", SYMLINK+="input/wacom-$env{WACOM_TYPE}"
# but for legacy reasons, we keep the input/wacom link as the generic stylus device.
ATTRS{idVendor}=="056a", ATTRS{idProduct}=="00d1", ENV{WACOM_TYPE}=="stylus", SYMLINK+="input/wacom"
ATTRS{idVendor}=="056a", ATTRS{idProduct}=="00d1", ENV{WACOM_TYPE}=="touch", SYMLINK+="input/wacom-touch"
# Check and repossess the device if a module other than the wacom one
# is already bound to it.
ATTRS{idVendor}=="056a", ACTION=="add", RUN+="check_driver wacom $devpath $env{ID_BUS}"
LABEL="wacom_end"
