applying patch

I installed rpm and extracted it
rpm2cpio myrpmfile.rpm | cpio -idmv

there is a file call libXYZ.patch

I need to apply the patch to the source before I can compile the source code.
How to apply the patch?
perlperlAsked:
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jlevieCommented:
Something along the lines of "patch -pN patch-file" with N being some number from 0 up. The value of N is the number of path elements that must be stripped from the file specs in the patch file to find the file to patch for the current environment. See "man patch" for a better explanation.
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Duncan RoeSoftware DeveloperCommented:
Pretty much as jlevie said, if you plan to build libXYZ by hand. If you are in doubt about -pN, post the first few lines of the patch here and we can show you how to work it out.
This sounds like an SRPM. If you had extracted it with rpm (it goes to a fixed path in /usr/src/rpm if you do) then building with rpmbuild would probably have applied the patch for you. (If you eschewed that route I don't blame you;)
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