check if timegm is present before emulating
diff --git a/tests/125-bitstring-constraint-OK.asn1.-X b/tests/125-bitstring-constraint-OK.asn1.-X
index cb3bc7c..b33fecc 100644
--- a/tests/125-bitstring-constraint-OK.asn1.-X
+++ b/tests/125-bitstring-constraint-OK.asn1.-X
@@ -1,4 +1,4 @@
-<!-- XML DTD generated by asn1c-0.9.27 -->
+<!-- XML DTD generated by asn1c-0.9.28 -->
 
 <!-- ASN.1 module
 ModuleBitStringConstraint { iso org(3) dod(6) internet(1) private(4)