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Newbie question: Applying kernel patch for Thinkpad laptop

I am using kernel-2.6.21.5 on Slackware 12.0 on my IBM thinkpad laptop. I would like to re-compile kernel to enable acpi support, so I downloaded a patch file "thinkpad-acpi-0.14-20070701_v2.6.21.5.patch.gz" from
http://ibm-acpi.sourceforge.net/
What I did is unzip the patch file and apply the patch

Code:

# gunzip /home/chunhua/Downloads/thinkpad-acpi-0.14-20070701_v2.6.21.5.patch.gz

# patch -d /usr/src/linux-2.6.21.5/ < /home/chunhua/Downloads/thinkpad-acpi-0.14-20070701_v2.6.21.5.patch 

The next patch would delete the file ibm-acpi.txt,

which does not exist!  Assume -R? [n] 

Apply anyway? [n]

Am I doing something stupid? I should answer yes or no? I have never applied any patches before. Can someone instruct me how to apply a patch?

Hmm, try this:
cd to the Linux kernel source directory
then run patch with -p1

Code:

# cd /usr/src/linux-2.6.21.5

# patch -p1 < /home/chunhua/Downloads/thinkpad-acpi-0.14-20070701_v2.6.21.5.patch