zmq_osx_issue.diff

diff --git a/src/clock.cpp b/src/clock.cpp
index a225e77..0a7404e 100644
--- a/src/clock.cpp
+++ b/src/clock.cpp
@@ -153,9 +153,11 @@ uint64_t zmq::clock_t::now_us ()
     //  Use POSIX clock_gettime function to get precise monotonic time.
     struct timespec tv;
 
-#if defined ZMQ_HAVE_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12    
+#if defined ZMQ_HAVE_OSX && MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12    
+    printf("using alt_clock_gettime\n");
     int rc = alt_clock_gettime (CLOCK_MONOTONIC, &tv);
 #else
+    printf("using clock_gettime\n");
     int rc = clock_gettime (CLOCK_MONOTONIC, &tv);
 #endif
     // Fix case where system has clock_gettime but CLOCK_MONOTONIC is not supported.
diff --git a/src/condition_variable.hpp b/src/condition_variable.hpp
index d8c8095..cb1b49d 100644
--- a/src/condition_variable.hpp
+++ b/src/condition_variable.hpp
@@ -213,9 +213,11 @@ namespace zmq
             if (timeout_ != -1) {
                 struct timespec timeout;
 
-#if defined ZMQ_HAVE_OSX && __MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12
+#if defined ZMQ_HAVE_OSX && MAC_OS_X_VERSION_MIN_REQUIRED < 101200 // less than macOS 10.12
+                printf("using alt_clock_gettime\n");
                 alt_clock_gettime(CLOCK_REALTIME, &timeout);
 #else
+                printf("using clock_gettime\n");
                 clock_gettime(CLOCK_REALTIME, &timeout);
 #endif