diff --git a/README.md b/README.md
index 30658c0..97cebcc 100644
--- a/README.md
+++ b/README.md
@@ -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
 
diff --git a/setup.py b/setup.py
index 5a75a1c..17b60c3 100644
--- a/setup.py
+++ b/setup.py
@@ -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"],