diff --git a/examples/example00.py b/examples/example00.py
index 8f8dfd0..e98360e 100644
--- a/examples/example00.py
+++ b/examples/example00.py
@@ -45,7 +45,8 @@ for d in densities:
     # compute the corresponding averaged radius (in Bohr units)
     rs = ( (1/d) / ((4/3) * np.pi) ) ** (1/3) / a0
     # Some output printing
-    print("Computing {} for RS={}".format(plot_type, rs))
+    stem = 'plas_disp'
+    print("Computing {} for RS={}".format(stem, rs))
     # Here is the actual call to calculate
     data = compute(N_Q=100, RS=rs, T=T)
     # 'data' is a dict, each key is the name of an output file (without extansion).
@@ -53,7 +54,7 @@ for d in densities:
     # the number of points chosen and on the kind of output file.
 
     # Reading data
-    X, Y = data['plas_disp'].T
+    X, Y = data[stem].T
     # Plotting
     plt.plot(X, Y, label=r'density={:.2e} $e/cm^3$'.format(d))
 
diff --git a/src/Makefile b/src/Makefile
index aa8943f..2540d34 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -280,7 +280,7 @@ pypkg: python/dist/$(PYTHON_PKG_NAME)-$(VERSION).tar.gz
 
 
 required_python_packages:
-	@$(PIP) install numpy click-man
+	@$(PIP) install numpy matplotlib click-man
 
 
 python/VERSION:
diff --git a/src/python/msspec_dfm/__init__.py b/src/python/msspec_dfm/__init__.py
index d52165f..a3a6446 100644
--- a/src/python/msspec_dfm/__init__.py
+++ b/src/python/msspec_dfm/__init__.py
@@ -21,4 +21,7 @@
 # Committed by : Sylvain Tricot <sylvain.tricot@univ-rennes1.fr> 1645806435 +0100
 
 from msspec_dfm.version import __version__
-from msspec_dfm.compute import compute
+try:
+    from msspec_dfm.compute import compute
+except ModuleNotFoundError as err:
+    pass