diff --git a/aclocal/ax_lib_event.m4 b/aclocal/ax_lib_event.m4
index 7d2f98a..cf6c4c2 100644
--- a/aclocal/ax_lib_event.m4
+++ b/aclocal/ax_lib_event.m4
@@ -165,7 +165,7 @@
             if test -n "$ax_libevent_path"; then
               AX_LIB_EVENT_DO_CHECK
             else
-              for ax_libevent_path in "" /usr /usr/local /opt /opt/local /opt/libevent "$LIBEVENT_ROOT" ; do
+              for ax_libevent_path in "" $lt_sysroot/usr $lt_sysroot/usr/local $lt_sysroot/opt $lt_sysroot/opt/local $lt_sysroot/opt/libevent "$LIBEVENT_ROOT" ; do
                 AX_LIB_EVENT_DO_CHECK
                 if test "$success" = "yes"; then
                   break;