diff --git a/bin/compile b/bin/compile
index 0c933e9..6533c4a 100755
--- a/bin/compile
+++ b/bin/compile
@@ -229,6 +229,17 @@ for dir in $CACHED_DIRS; do
   cp -R $dir $CACHE_DIR/
 done
 
+# Set context environment variables.
+
+set-env PATH /app/.heroku/venv/bin:/bin:/usr/local/bin:/usr/bin
+set-env PYTHONUNBUFFERED true
+set-env LIBRARY_PATH /app/.heroku/vendor/lib
+set-env LD_LIBRARY_PATH /app/.heroku/vendor/lib
+set-env LANG en_US.UTF-8
+set-env PYTHONHASHSEED random
+set-env PYTHONHOME /app/.heroku/venv/
+set-env PYTHONPATH /app/
+
 # ### Fin.
 
 # Experimental post_compile hook.