compilation.md

@@ -42,6 +42,21 @@ It will build the sphinx documentation in:
  * docs/Pre/
 But the one provided shoud be up-to-date
 
+Our policy is to not mess with default system paths. So instead we advise to
+use a environment variable to add to python the path to our build directory.
+In general adding the following lines to your *.bashrc* (Linux) or *.profile* (MacOS)
+file does the trick. Of course you have to replace *mybuildpath* by the path to
+your own building directory (in the example above `~/Desktop/LMGC90/lmgc90_user/build`).
+Basically it is what returns the command *pwd* when ran in the same directory you
+ran the commands *cmake* and *make*.
+
+```shell
+if [ -z ${PYTHONPATH} ]; then
+  export PYTHONPATH=mybuildpath
+else
+  export PYTHONPATH=${PYTHONPATH}:mybuildpath
+fi
+```
 
 ## <a name=precompiled> Windows </a> ##
 
@@ -53,3 +68,10 @@ choose the corresponding binaries of LMGC90:
 
 Then unzip the downloaded in the `lmgc90_user/build` directory. It should create a `pylmgc90-xxxx-py27` (where `xxxx`
 is to replaced by `i686` or `x86_64` depending on the downloaded version).
+
+Finally start the `Spyder` program. Then click on the upper line `tools` and `PYTHONPATH manager`.
+Then click `Add a path` on lower left corner and select the path to the directory
+previously unzipped ( *.../lmgc90_user/build/pylmgc90-xxxx-py27*).
+
+Finally, so that the previous step is taken into account in your current environment, simply restart `Spyder`
+program.
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