diff --git a/install-cmocka-linux.sh b/install-cmocka-linux.sh
index a9530ac2..d3eb6959 100755
--- a/install-cmocka-linux.sh
+++ b/install-cmocka-linux.sh
@@ -1,6 +1,6 @@
 #!/bin/sh
 set -ex
-mkdir cmocka
+mkdir -p cmocka
 #wget https://cmocka.org/files/1.1/cmocka-1.1.0.tar.xz -O /tmp/cmocka-1.1.0.tar.xz
 wget --no-check-certificate http://cmocka.org/files/1.1/cmocka-1.1.0.tar.xz -O /tmp/cmocka-1.1.0.tar.xz
 tar -xf /tmp/cmocka-1.1.0.tar.xz -C /tmp
diff --git a/tests/regress/Makefile b/tests/regress/Makefile
index 431cdf32..c7da4ec4 100644
--- a/tests/regress/Makefile
+++ b/tests/regress/Makefile
@@ -1,6 +1,11 @@
 CFLAGS += -Wall -Werror -I../../include
 LDLIBS += -L../../ -lpthread -lm -lunicorn
 
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S), Linux)
+LDLIBS += -lrt
+endif
+
 EXECUTE_VARS = LD_LIBRARY_PATH=../../cmocka/src:../../ DYLD_LIBRARY_PATH=../../
 
 TESTS_SOURCE = $(wildcard *.c)
diff --git a/tests/unit/Makefile b/tests/unit/Makefile
index 0768210a..57b8c038 100644
--- a/tests/unit/Makefile
+++ b/tests/unit/Makefile
@@ -3,6 +3,12 @@ CFLAGS += -L ../../ -I ../../include
 CFLAGS += -L ../../cmocka/src -I ../../cmocka/include
 LDLIBS += -lcmocka -lunicorn
 
+UNAME_S := $(shell uname -s)
+ifeq ($(UNAME_S), Linux)
+LDLIBS += -lrt
+endif
+
+
 EXECUTE_VARS = LD_LIBRARY_PATH=../../cmocka/src:../../ DYLD_LIBRARY_PATH=../../
 
 ifeq ($(UNICORN_ASAN),yes)