AFAICS this shouldn't be fixed by adding an explicit architecture list but by changing the build-dep from ocaml-best-compilers to ocaml-native-compilers. This will prevent build attempts on architectures where only the _all.deb would be built, those packages will be available anyways as long as there is a single debian architecture with native ocaml, and it allows to simply set the buildds to wait-dep for ocaml-native-compilers instead of keeping the architecture list in sync with the native ocaml support in Debian.
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