document --with-systrace

diff --git a/INSTALL b/INSTALL
index 57d04474df48f2d1fd3556025fe6e625aea7c742..7be93a51aacf3bd8bf60b27971a54d8a97dff302 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -242,6 +242,14 @@ Special features/options:
         is to compile noexec support if libtool supports building
         shared objects on your OS.
 
+  --with-systrace[=DIR]
+       Enable support for the systrace(4) tracing facility.  This
+       allows sudo to control execution of further commands by
+       the program being run through sudo.  On systems with
+       systrace(4) support this is a better option than the
+       "noexec" facility.  If DIR is specified it indicates the
+       directory in which to find the systrace.h include file.
+
   --disable-root-mailer
         By default sudo will run the mailer as root when tattling
         on a user so as to prevent that user from killing the mailer.