diff --git a/perf/Makefile.am b/perf/Makefile.am
index 1382672..462a5f7 100644
--- a/perf/Makefile.am
+++ b/perf/Makefile.am
@@ -1,5 +1,5 @@
 
-LDADD = ../src/.libs/libpmalloc.la
+LDADD = ../src/.libs/libpmalloc.la -lrt
 
 AM_CFLAGS = -I../src
 
diff --git a/perf/common.c b/perf/common.c
index b052543..63f9bae 100644
--- a/perf/common.c
+++ b/perf/common.c
@@ -9,27 +9,12 @@ Persistent Memory Library Example
 #include "pmalloc.h"
 #include "common.h"
 
-#ifdef __MACH__
-#include <mach/clock.h>
-#include <mach/mach.h>
-#endif
-
 unsigned int init_random(unsigned int seed)
 {
 	unsigned int ret = seed;
 	if (0 == seed) {
 		struct timespec ts;
-                #ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
-                clock_serv_t cclock;
-                mach_timespec_t mts;
-                host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
-                clock_get_time(cclock, &mts);
-                mach_port_deallocate(mach_task_self(), cclock);
-                ts.tv_sec = mts.tv_sec;
-                ts.tv_nsec = mts.tv_nsec;
-		#else
-                clock_gettime(CLOCK_MONOTONIC, &ts);
-                #endif
+		clock_gettime(CLOCK_MONOTONIC, &ts);
 		ret = (unsigned)ts.tv_nsec;
 	}
 	srand(ret);
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 2f464ac..00ed85f 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -7,25 +7,25 @@ check_pmalloc_SOURCES = check_pmalloc.c check_common.c
 
 check_pmalloc_CFLAGS = -I../src @CHECK_CFLAGS@
 
-check_pmalloc_LDADD = ../src/libpmalloc.la @CHECK_LIBS@
+check_pmalloc_LDADD = ../src/libpmalloc.la @CHECK_LIBS@ -lrt
 
 check_pmrecycle_SOURCES = check_pmrecycle.c check_common.c
 
 check_pmrecycle_CFLAGS = -I../src @CHECK_CFLAGS@
 
-check_pmrecycle_LDADD = ../src/libpmalloc.la @CHECK_LIBS@
+check_pmrecycle_LDADD = ../src/libpmalloc.la @CHECK_LIBS@ -lrt
 
 check_pmclear_SOURCES = check_pmclear.c check_common.c
 
 check_pmclear_CFLAGS = -I../src @CHECK_CFLAGS@
 
-check_pmclear_LDADD = ../src/libpmalloc.la @CHECK_LIBS@
+check_pmclear_LDADD = ../src/libpmalloc.la @CHECK_LIBS@ -lrt 
 
 check_pmsimulate_SOURCES = check_pmsimulate.c check_common.c
 
 check_pmsimulate_CFLAGS = -I../src @CHECK_CFLAGS@
 
-check_pmsimulate_LDADD = ../src/libpmalloc.la @CHECK_LIBS@
+check_pmsimulate_LDADD = ../src/libpmalloc.la @CHECK_LIBS@ -lrt 
 
 clean-local:
 	rm -f *.data *.dat
diff --git a/tests/check_common.c b/tests/check_common.c
index 9d5d7c3..8b2563f 100644
--- a/tests/check_common.c
+++ b/tests/check_common.c
@@ -9,25 +9,10 @@ Persistent Memory Library Tests
 #include "pmalloc.h"
 #include "check_common.h"
 
-#ifdef __MACH__
-#include <mach/clock.h>
-#include <mach/mach.h>
-#endif
-
 void init_random() 
 {
     struct timespec ts;
-    #ifdef __MACH__ // OS X does not have clock_gettime, use clock_get_time
-    clock_serv_t cclock;
-    mach_timespec_t mts;
-    host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
-    clock_get_time(cclock, &mts);
-    mach_port_deallocate(mach_task_self(), cclock);
-    ts.tv_sec = mts.tv_sec;
-    ts.tv_nsec = mts.tv_nsec;
-    #else
     clock_gettime(CLOCK_MONOTONIC, &ts);
-    #endif
     srand((unsigned)ts.tv_nsec);
 }