diff --git a/postBuild b/postBuild
new file mode 100644
index 0000000..00477e1
--- /dev/null
+++ b/postBuild
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+# run matplotlib once to generate the font cache
+python -c "import matplotlib as mpl; mpl.use('Agg'); import pylab as plt; fig, ax = plt.subplots(); fig.savefig('test.png')"
+	
+test -e test.png && rm test.png
+
+jupyter labextension install @jupyterlab/latex
+jupyter lab build