The current input-wacom-0.30.1 driver fails to compile for the Linux 2.6.38 kernel. This is because the code within the 2.6.38 folder makes use of the kstrtouint function that was introduced in Linux 2.6.39. It should be replaced with an equivalent such as strict_strtoul.
Fixed by 33a0f56
Fix part of 0.30.2