how to patch firmware files when building v2.3 from sources?

[ludenus]

new here

I've been trying  to build v.2.3 from sources following these instructions http://magiclantern.wikia.com/wiki/Build_instructions/Unified . After just a few manipulations "make" and "make zip" succeeded and I've got zip archive with autoexec and ML folder. The sad thing was that zip package had no *.fir files inside. I've tried to run "make fir" but got the following error message:

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python: can't open file '../../../dumper/build_fir.py': [Errno 2] No such file or directory
Grepping sources finds several lines that use build_fir.py script for patching firmware:

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./installer/50D.109/Makefile: python ../../../dumper/build_fir.py -r ../../../dumper/50D00109.FIR updater.bin $(UPDATE_NAME)
but there is  no build_fir.py script in magic-lantern sources fetched from hg repository.

QUESTION:
Can someone please clarify whether it is possible to patch firmware and if it is - how to do it?

[JYves]

Had the same problem. Used the *.fir from the last release and copied all of them on the root of the SD.
I also had to move the FONT.dat file to the root of the SD.

JY.