diff --git a/CMakeLists.txt b/CMakeLists.txt
index 049ca5d08..447c0e334 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -204,6 +204,16 @@ check_type_size("ucontext_t" HAVE_UCONTEXT_T)
 
 # *** LIBRARY CHECKS ***
 
+if (UNIX)
+    include (CheckLibraryExists)
+    CHECK_LIBRARY_EXISTS(rt clock_gettime "time.h" HAVE_CLOCK_GETTIME)
+    if(NOT HAVE_CLOCK_GETTIME)
+        message(FATAL_ERROR "clock_gettime not found")
+    else(NOT HAVE_CLOCK_GETTIME)
+        list(APPEND ZM_BIN_LIBS "-lrt")
+    endif(NOT HAVE_CLOCK_GETTIME)
+endif(UNIX)
+
 # zlib
 find_package(ZLIB)
 if(ZLIB_FOUND)