It works?

.github/workflows/build.yml

@@ -27,38 +27,35 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        # - name: Windows
-        #   uses: windows-latest
-        #   ocaml:
-        #     ocaml-compiler: ocaml-variants.5.1.1+options,ocaml-option-mingw
-        #     # Copied from https://github.com/ocaml-multicore/eio/blob/main/.github/workflows/main.yml
-        #     opam-depext: false
-        #     opam-repositories: |
-        #       dra27: https://github.com/dra27/opam-repository.git#windows-5.0
-        #       normal: https://github.com/ocaml/opam-repository.git
-        #   input-file: illuaminate.exe
-        #   output-file: illuaminate-windows-x86_64.exe
-        #   dune-flags:
+        - name: Windows
+          uses: windows-latest
+          ocaml:
+            ocaml-compiler: ocaml-variants.5.1.1+options,ocaml-option-mingw
+            # Copied from https://github.com/ocaml-multicore/eio/blob/main/.github/workflows/main.yml
+            opam-depext: false
+            opam-repositories: |
+              dra27: https://github.com/dra27/opam-repository.git#windows-5.0
+              normal: https://github.com/ocaml/opam-repository.git
+          input-file: illuaminate.exe
+          output-file: illuaminate-windows-x86_64.exe
+          dune-flags:
 
         - name: Linux
           uses: ubuntu-latest
           # We don't use flambda as that ends up much buliker than without.
           ocaml:
-            # Ideally we'd use ocaml-variants.5.1.1+options,ocaml-option-musl, but
-            # I can't make that work.
-            # ocaml-compiler: "5.1.1"
             ocaml-compiler: ocaml-variants.5.1.1+options,ocaml-option-static
           input-file: illuaminate
           output-file: illuaminate-linux-x86_64
           dune-flags: --workspace dune-workspace.release
 
-        # - name: macOS
-        #   uses: macos-latest
-        #   ocaml:
-        #     ocaml-compiler: "5.1.1"
-        #   input-file: illuaminate
-        #   output-file: illuaminate-macos-x86_64
-        #   dune-flags:
+        - name: macOS
+          uses: macos-latest
+          ocaml:
+            ocaml-compiler: "5.1.1"
+          input-file: illuaminate
+          output-file: illuaminate-macos-x86_64
+          dune-flags:
 
     name: Build ${{ matrix.name }}
     runs-on: ${{ matrix.uses }}
@@ -67,8 +64,13 @@ jobs:
       with:
         fetch-depth: 0
 
+    # This is required to make the static/musl build work. I *believe*, OCaml
+    # finds the glibc libzstd during ./configure, and then looks for a musl
+    # version when compiling. Not 100% sure, as I've not been able to reproduce
+    # this failure locally.
     - name: Remove libzstd
       run: sudo apt remove libzstd-dev --yes
+      if: "matrix.name == 'Linux'"
 
     - name: Use OCaml
       uses: ocaml/setup-ocaml@v2