+\begin_layout Section
+Environment variables
+\end_layout
+
+\begin_layout Standard
+The following environment variables change the behavior of libust.
+\end_layout
+
+\begin_layout Description
+UST_TRACE When defined, automatically enables tracing.
+\end_layout
+
+\begin_layout Description
+UST_AUTOPROBE When value is 1, enable all markers automatically.
+ When value is a regular expression, enable all markers whose name matches
+ the regular expression.
+\end_layout
+
+\begin_layout Description
+UST_DAEMON_SOCKET If not set, the default location of the daemon socket
+ is used.
+ If set, the value is used as path to the ustd socket.
+\end_layout
+