compilation.md

@@ -114,7 +114,7 @@ Then move to `lmgc90_user_xxxx` folder with `cd` command
 and build lmgc90 by issuing the following commands:
 ```cmd
 cd build
-cmake .. -DVENV_PATH=%CONDA_PREFIX% -G "MinGW Makefiles" -DBUILD_rTree_BINDING=OFF
+cmake .. -DVENV_PATH="$env:CONDA_PREFIX" -G "MinGW Makefiles" -DBUILD_rTree_BINDING=OFF
 mingw32-make install
 ..\finalize_conda_env.bat
 ```