try fix mentioned in #61

Author: mikedh

pyproject.toml

@@ -105,7 +105,8 @@ archs = ["x86_64"]
 
 [tool.cibuildwheel.macos]
 before-all = "bash build_dependencies/install_macos.sh"
-archs = ["x86_64"]
+environment = { CPATH = "$(brew --prefix)/include:$(brew --prefix)/include/eigen3", LD_LIBRARY_PATH = "$(brew --prefix)/lib" }
+archs = ["x86_64", "universal"]
 
 [tool.cibuildwheel.windows]
 before-all = "powershell build_dependencies\\install_windows.ps1"