Build fails when TOUCHSCREEN_SWEEP2WAKE is defined

[arzam16]

If TOUCHSCREEN_SWEEP2WAKE is defined in .config then build fails with the following log:

LD      .tmp_vmlinux1
drivers/built-in.o: In function `detect_sweep2wake':
/.../kernel_acer_b1_a71_xdavidwu/kernel/drivers/input/touchscreen/sweep2wake.c:168: undefined reference to `is_single_touch'
Makefile:900: recipe for target '.tmp_vmlinux1' failed
make: *** [.tmp_vmlinux1] Error 1

I think I should've reported this error to xdavidwu himself, but am not sure if he would fix it after 5 years of him not working on his repository.
Workaround:
Build kernel without TOUCHSCREEN_SWEEP2WAKE feature.