diff --git a/libisoburn/trunk/test/configure_ac.txt b/libisoburn/trunk/test/configure_ac.txt
index 3bfa0fd9..20f8afa6 100644
--- a/libisoburn/trunk/test/configure_ac.txt
+++ b/libisoburn/trunk/test/configure_ac.txt
@@ -42,6 +42,12 @@ AC_PROG_INSTALL
 
 AC_CHECK_HEADERS()
 
+AC_CHECK_MEMBER([struct tm.tm_gmtoff],
+	[AC_DEFINE(HAVE_TM_GMTOFF, 1,
+		[Define this if tm structure includes a tm_gmtoff entry.])],
+	,
+	[#include <time.h>])
+
 THREAD_LIBS=-lpthread
 AC_SUBST(THREAD_LIBS)