build_linux.md

@@ -16,7 +16,7 @@ sudo apt install intel-oneapi-tbb
 echo "source /opt/intel/oneapi/tbb/latest/env/vars.sh" >> ~/.bashrc
 # Python 3
 sudo apt install python3-dev
-python3 -m pip install numpy mpi4py matplotlib
+python3 -m pip install numpy mpi4py matplotlib voluptuous
 # Gmsh
 python3 -m pip install gmsh
 ```