fix test to see if $PERL is set

(cherry picked from commit 44f0f310d41acc5c772d38353fe35ddacb3fee80)

diff --git a/bin/tests/system/run.sh b/bin/tests/system/run.sh
index c76805db1494c43eacbbc40cd84dc392d4f62681..9e1e5c21205f512c0a5ea61a5036f61bbdbf0059 100644 (file)
--- a/bin/tests/system/run.sh
+++ b/bin/tests/system/run.sh
@@ -39,7 +39,7 @@ echo "S:$test:`date`" >&2
 echo "T:$test:1:A" >&2
 echo "A:System test $test" >&2
 
-if [ x$PERL = x ]
+if [ x${PERL:+set} = x ]
 then
     echo "I:Perl not available.  Skipping test." >&2
     echo "R:UNTESTED" >&2