Set EM_PKG_CONFIG_PATH to correctly configure pkg-config

[swnf]

Closes #51

[hoodmane]

Makes sense to me, thanks!

[hoodmane]

@ryanking13 you have any thoughts?

[ryanking13]

Looks okay to me, but could you please test it with your PR to verify (pyodide/pyodide#5154)?

You can change the pyodide-build version used in our PR (https://pyodide.org/en/latest/development/maintainers.html#updating-pyodide-build)

[swnf]

I pushed a new commit to pyodide/pyodide#5154 that uses the updated pyodide-build

[ryanking13]

Thanks. Could you please update the changelog?

[swnf]

@ryanking13 I don't think this PR is ready to be merged. The second commit I pushed to fix random pipeline failures might be related to a scipy test failure (pipeline failed three times). I will try to investigate this issue and add a changelog after that.

[swnf]

The pipeline failure seems to be caused by two issues with scipy:

• The file libopenblas.so is not included in the wheel
• The openblas build script patches dist/libopenblas.so to include libf2c (static library). But scipy explicitly uses $WASM_LIBRARY_DIR/lib/libopenblas.so which is not patched. This causes the libf2c symbols (like s_cmp) to be missing.

I've pushed a64975df to my PR pyodide/pyodide#5154 to fix this. The pipeline is now green. I have no clue why the build worked before or what exactly broke it.

This PR should now be ready to be merged. I've rebased it on main and updated the changelog.