http://bugs.gentoo.org/270483

ripped from fedora

--- ntp-4.2.4p7/include/ntp_syscall.h
+++ ntp-4.2.4p7/include/ntp_syscall.h
@@ -14,5 +14,13 @@
 # include <sys/timex.h>
 #endif
 
+#if defined(ADJ_NANO) && !defined(MOD_NANO)
+#define MOD_NANO ADJ_NANO
+#endif
+
+#if defined(ADJ_TAI) && !defined(MOD_TAI)
+#define MOD_TAI ADJ_TAI
+#endif
+
 #ifndef NTP_SYSCALLS_LIBC
 #ifdef NTP_SYSCALLS_STD