Index: tests/41-noise-purefreqs.test
--- tests/41-noise-purefreqs.test.orig
+++ tests/41-noise-purefreqs.test
@@ -1 +1 @@
-exec ./40-noise.test 1200 -M 1200 -S 2400
+sh ./40-noise.test 1200 -M 1200 -S 2400