diff --git a/src/libCom/osi/os/posix/osdTime.cpp b/src/libCom/osi/os/posix/osdTime.cpp
index 0f91ee427..0ea1b96ff 100644
--- a/src/libCom/osi/os/posix/osdTime.cpp
+++ b/src/libCom/osi/os/posix/osdTime.cpp
@@ -24,6 +24,11 @@
 
     #define TIME_INIT ClockTime_Init(CLOCKTIME_NOSYNC)
 #else
+    /* Some posix systems like Darwin don't have CLOCK_REALTIME */
+
+    #define TIME_INIT generalTimeCurrentTpRegister("GetTimeOfDay", \
+        LAST_RESORT_PRIORITY, osdTimeGetCurrent)
+
     extern "C" {
     static int osdTimeGetCurrent (epicsTimeStamp *pDest)
     {
@@ -37,9 +42,6 @@
         return epicsTimeOK;
     }
     } // extern "C"
-
-    #define TIME_INIT generalTimeCurrentTpRegister("GetTimeOfDay", \
-        LAST_RESORT_PRIORITY, osdTimeGetCurrent)
 #endif
 
 static int timeRegister(void)
diff --git a/src/libCom/osi/osiClockTime.c b/src/libCom/osi/osiClockTime.c
index 3ba74e5ae..ea3e0c3eb 100644
--- a/src/libCom/osi/osiClockTime.c
+++ b/src/libCom/osi/osiClockTime.c
@@ -37,6 +37,12 @@ static struct {
 static epicsThreadOnceId onceId = EPICS_THREAD_ONCE_INIT;
 
 
+#ifdef CLOCK_REALTIME
+/* This code is not used on systems without Posix CLOCK_REALTIME such
+ * as Darwin, but the only way to detect that is from the OS headers,
+ * so the Makefile can't exclude building this file on those systems.
+ */
+
 /* Forward references */
 
 static int ClockTimeGetCurrent(epicsTimeStamp *pDest);
@@ -147,7 +153,7 @@ static int ClockTimeGetCurrent(epicsTimeStamp *pDest)
 
     /* If a Hi-Res clock is available and works, use it */
     #ifdef CLOCK_REALTIME_HR
-        clock_gettime(CLOCK_REALTIME_HD, &clockNow) &&
+        clock_gettime(CLOCK_REALTIME_HR, &clockNow) &&
     #endif
     clock_gettime(CLOCK_REALTIME, &clockNow);
 
@@ -165,6 +171,11 @@ static int ClockTimeGetCurrent(epicsTimeStamp *pDest)
 }
 
 
+#endif /* CLOCK_REALTIME */
+/* Allow the following report routine to be compiled anyway
+ * to avoid getting a build warning from ranlib.
+ */
+
 /* Status Report */
 
 int ClockTime_Report(int level)