--- zzzz-none-000/linux-4.9.218/tools/testing/selftests/ptp/testptp.c	2020-04-02 15:20:41.000000000 +0000
+++ seale-7590ax-750/linux-4.9.218/tools/testing/selftests/ptp/testptp.c	2023-03-29 10:59:08.000000000 +0000
@@ -48,6 +48,7 @@
 #define CLOCK_INVALID -1
 #endif
 
+#if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
 /* clock_adjtime is not available in GLIBC < 2.14 */
 #if !__GLIBC_PREREQ(2, 14)
 #include <sys/syscall.h>
@@ -56,6 +57,7 @@
 	return syscall(__NR_clock_adjtime, id, tx);
 }
 #endif
+#endif
 
 static clockid_t get_clockid(int fd)
 {