nsigned long long is not 64bits on mips64 or powerpc64 unless
Just explicitly ask for __u64 so we know what we mean

Index: rt-app-1.0/src/rt-app_utils.h
===================================================================
--- rt-app-1.0.orig/src/rt-app_utils.h
+++ rt-app-1.0/src/rt-app_utils.h
@@ -118,7 +118,7 @@ log_timing(FILE *handler, timing_point_t
 pid_t
 gettid(void);
 
-unsigned long long
+__u64
 timespec_to_nsec(struct timespec *ts);
 #endif