Example: C:\Program
Files\DCpp_orig>patch -p1 < my-patch.diff
C:\Program Files\DCpp_orig is the directory that is going to be patched.
p1 gives the entire file name unmodified with out a leading slash.
Parameters and more
information how-to use GNU Patch can be found in the documentation for
GNU Patch which should have been accommodated with GNU Patch.
Otherwise,
click here 