How to make OCaml work on termux for Android

plicatibu · September 27, 2025, 5:39am

Hi all.

I tried to install OCaml on Termux for Android but I failed.

Does anyone succeeded ?

Thanks in advance.

kit-ty-kate · September 27, 2025, 11:17am

OCaml currently doesn’t support Android, at least not recent versions and not without extra patches. There are some upstreaming efforts in ocaml/ocaml#13405 for example

Rucikir · September 29, 2025, 9:15pm

That’s not entirely true; my unfinished PR Provide a system(3) replacement on Android (+ build OCaml on Android) #13405 fixes system(3) is disabled on Android, which prevent(ed?) building OCaml in Termux, but you can definitely build an OCaml cross-compiler targeting Android, and use it to cross-build programs for Android; as a matter of fact we do it sometimes in the CI:

github.com/ocaml/ocaml

.github/workflows/build-cross.yml

b5cfb4479


      
          cross-android:
            runs-on: ubuntu-latest
            needs: non-cross
            env:
              # https://developer.android.com/ndk/downloads#lts-downloads
              NDK: r27d # Latest LTS Version
              API_LEVEL: 21
            steps:
              - name: Download Artifact
                uses: actions/download-artifact@v4
                with:
                  name: non-cross-ocaml
              - name: Install non-cross OCaml
                run: |
                  set -x
                  tar xaf ocaml.tar.zst -C "$HOME"
                  rm -f ocaml.tar.zst
                  echo "$HOME/.local/bin" >> "$GITHUB_PATH"
              - name: Restore the Android NDK from cache
                uses: actions/cache/restore@v4

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How to make OCaml work on termux for Android

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