Patches in patches/<branch>/*.patch are applied with git apply in lexicographic order after the branch (or pinned commit) is checked out, before the build starts. A patch that fails to apply fails the mod's build for that platform.

Use this as a last resort for changes upstream refuses to take — prefer sending fixes upstream. Builds with patches applied are marked with "patched": true in their manifest.json source metadata, since the recorded tree hash refers to the unpatched upstream commit.

Layout example:

patches/
  field_intensity_1.7/
    0001-fix-cxx-standard.patch
    0002-something-else.patch

The directory name must match the manifest entry's branch value.