# define GET_TIME(x) x = GetTickCount()
# define MS_TIME_DIFF(a,b) ((long)((a)-(b)))
# elif defined (__L4)
-# include <l4/re/env.h>
-# define CLOCK_TYPE l4_cpu_time_t
-# define CLOCKS_PER_SEC 1000000
-# define MS_TIME_DIFF(a,b) ((long)((a)-(b)))
-# define GET_TIME(x) x = l4re_kip()->clock
+# ifndef GET_TIME
+# include <l4/re/env.h>
+# define CLOCK_TYPE l4_cpu_time_t
+# define CLOCKS_PER_SEC 1000000
+# define MS_TIME_DIFF(a,b) ((long)((a)-(b)))
+# define GET_TIME(x) x = l4re_kip()->clock
+# endif
# else /* !MSWIN32, !MSWINCE, !BSD_TIME */
# include <time.h>
# if !defined(__STDC__) && defined(SPARC) && defined(SUNOS4)