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Troubleshooting compiling TreePPL on legacy MacOS systems #51

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Expand Up @@ -39,3 +39,18 @@ At the end of your session, deactivate your virtual environment using
This will bring you back to your terminal window.


### Installing the developer version of TreePPL on MacOS

We have noticed that on MacOS systems with legacy versions of compilers and developer tools, it may be necessary to set the environment variable `SDKROOT` before installing the OCaml packages. Otherwise, problems may occurr during compilation of `owl`.

To address this, proceed according to instructions but add one more flag before installing the OCaml packages. Specifically, after exporting `OWL_CPPFLAGS` and before compiling OCaml packages, add an export of the appropriate path to the developer tools on your system (should be the one given below), as indicated below.

```bash
rm $HOMEBREW_PREFIX/bin/cc
export OWL_LDFLAGS="-L/opt/homebrew/opt/libomp/lib -lomp"
export OWL_CPPFLAGS="-Xpreprocessor -fopenmp"
export SDKROOT="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk"
```

After this, proceed according to the standard instructions.

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