fixed timezone compensation when parsing ASN.1 dates

configure.in

@@ -774,10 +774,6 @@ AC_SEARCH_LIBS(dlopen, dl, [DLLIB=$LIBS])
 LIBS=$saved_LIBS
 AC_SUBST(DLLIB)
 
-AC_CHECK_FUNCS(backtrace)
-AC_CHECK_FUNCS(prctl)
-AC_CHECK_FUNCS(gethostbyname_r)
-
 AC_MSG_CHECKING(for dladdr)
 AC_TRY_COMPILE(
 	[#define _GNU_SOURCE
@@ -788,6 +784,26 @@ AC_TRY_COMPILE(
 	[AC_MSG_RESULT([no])]
 )
 
+AC_CHECK_FUNCS(backtrace)
+AC_CHECK_FUNCS(prctl)
+AC_CHECK_FUNCS(gethostbyname_r)
+AC_CHECK_FUNCS(timegm)
+
+AC_MSG_CHECKING(for timezone variable)
+AC_TRY_LINK(
+	[#include <time.h>],
+	[/* check for timezone function (e.g. FreeBSD) */
+	 return (int)timezone(0, 0);],
+	[AC_MSG_RESULT([no])],
+	[AC_TRY_LINK(
+		[#include <time.h>],
+		[/* check for global variable */
+		 return (int)timezone;],
+		[AC_MSG_RESULT([yes]); AC_DEFINE([HAVE_VAR_TIMEZONE])],
+		[AC_MSG_RESULT([no])]
+	)]
+)
+
 AC_CHECK_HEADERS(net/pfkeyv2.h netipsec/ipsec.h)
 
 AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [],