diff --git a/binder/apt.txt b/binder/apt.txt
index 5c62b5aa..e32487cc 100644
--- a/binder/apt.txt
+++ b/binder/apt.txt
@@ -1 +1,2 @@
 tree
+libgl1-mesa-glx
diff --git a/binder/postBuild b/binder/postBuild
index a2a13d33..4487caf7 100644
--- a/binder/postBuild
+++ b/binder/postBuild
@@ -6,3 +6,7 @@ jupyter nbextension enable exercise2/main
 osf -p cmq8a fetch ds000221_subject/ds000221_sub-010006.zip data/ds000221_sub-010006.zip
 unzip data/ds000221_sub-010006.zip -d data
 rm data/ds000221_sub-010006.zip
+
+# export pythonpath
+export PYTHONPATH=utils/:$PYTHONPATH
+export PATH=utils/:$PATH
\ No newline at end of file