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add environment variables for non-default BOOST/CGAL #207

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add environment variables for non-default BOOST/CGAL #207

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14 changes: 6 additions & 8 deletions README.md
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Expand Up @@ -526,16 +526,14 @@ you can install/upgrade.

#### Troubleshooting

If pygalmesh fails to build due to `fatal error: 'Eigen/Dense' file not found`
you will need to create a symbolic link for Eigen to be detected, e.g.
If pygalmesh fails to build due to `fatal error: 'Eigen/Dense' file not found` set the `EIGEN_INCLUDE_DIR`
environment variable to the path to the Eigen include directory on your system.

```
cd /usr/local/include
sudo ln -sf eigen3/Eigen Eigen
```
There is also an environment variable for the location of `CGAL` includes which is `CGAL_INCLUDE_DIR`. `CGAL`
requires linking, so you will also need to make sure that the path to the `lib` dir is in the `LD_LIBRARY_PATH`
environment variable.

It's possible that `eigen3` could be in `/usr/include` instead of
`/usr/local/install`.
When linking against `CGAL >=5.0`, comment out the following line in the `setup.py` file. `libraries=["gmp","mpfr"]`.

#### Manual installation

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2 changes: 2 additions & 0 deletions setup.py
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Expand Up @@ -25,6 +25,8 @@
os.environ.get("EIGEN_INCLUDE_DIR", "/usr/include/eigen3/"),
# macos/brew:
"/usr/local/include/eigen3",
os.environ.get("CGAL_INCLUDE_DIR"),
os.path.join(os.environ.get("BOOST_ROOT"),"include"),
],
# no CGAL libraries necessary from CGAL 5.0 onwards
libraries=["gmp", "mpfr"],
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