compilation.md

@@ -31,7 +31,7 @@ one must run the next line by replacing `[absolute path to python]` by `/usr/bin
 whereas a macos user will use `/opt/local/bin/python`).
 ```shell
 cd build
-cmake .. -DPYTHON_EXECUTABLE=[absolute path to python]
+cmake .. -DPython_EXECUTABLE=[absolute path to python]
 make
 ```