Index: test/tools/hfst-check-environment.sh
--- test/tools/hfst-check-environment.sh.orig
+++ test/tools/hfst-check-environment.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/ksh
 TOOLDIR=../../tools/src
 old_opts="$HFST_OPTIONS"
 export HFST_OPTIONS="--version"