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diff --git a/pkg/ffmpeg/scripts/README.md b/pkg/ffmpeg/scripts/README.md
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+To generate `sources.txt`, first run configure ffmpeg
+
+	../src/configure
+
+Then, generate `vars.txt` from config.asm
+
+	awk '{print $2}' config.asm >vars.txt
+
+Build `sources.txt` from vars.txt and ffmpeg's `Makefile`s
+
+	make -f sources.mk >../sources.txt
+
+Finally, clean up what `./configure` left behind
+
+	git clean -df .