Fix for archs with 32 bits long.
--- utils/datetime_test.cpp.orig	Mon Dec 23 23:33:29 2013
+++ utils/datetime_test.cpp	Mon Dec 23 23:33:36 2013
@@ -86,7 +86,7 @@ ATF_TEST_CASE_BODY(delta__from_microseconds)
     }
     {
         const datetime::delta delta = datetime::delta::from_microseconds(
-            123456789123456);
+            123456789123456LL);
         ATF_REQUIRE_EQ(123456789, delta.seconds);
         ATF_REQUIRE_EQ(123456, delta.useconds);
     }