make RUNLTTV configurable in trace_matches

diff --git a/tests/trace_matches b/tests/trace_matches
index ef259bebded2992b23029d55c731dce47541878a..ae838fba66adf7fc8d124d9a87b65f79ceea1a0a 100755 (executable)
--- a/tests/trace_matches
+++ b/tests/trace_matches
@@ -1,6 +1,8 @@
 #!/bin/bash
 
-RUNLTTV=~/devel/lttv/runlttv
+if [ -z "$RUNLTTV" ]; then
+       RUNLTTV=~/devel/lttv/runlttv
+fi
 
 function error() {
        echo "$0: $@" >/dev/stderr