fix env var: s/DTRACE_TEST/DTRACE_TESTS/
#!perl
-# DTRACE_TEST=1 to skip to check prereqisites except for OS
+# DTRACE_TESTS=1 to skip to check prereqisites
# H2OLOG_DEBUG=1 for more runtime logs
use strict;
use warnings FATAL => "all";
@@ -16,7 +16,7 @@ run_as_root();
my $h2olog_prog = bindir() . "/h2olog";
my $client_prog = bindir() . "/h2o-httpclient";
-unless ($ENV{DTRACE_TEST}) {
+unless ($ENV{DTRACE_TESTS}) {
plan skip_all => "$h2olog_prog not found"
unless -e $h2olog_prog;
