diff --git a/configure.ac b/configure.ac
index 34038517c..7756e6b94 100644
--- a/configure.ac
+++ b/configure.ac
@@ -388,6 +388,17 @@ AC_C_BIGENDIAN
 # Checks for library functions.
 AC_FUNC_FORK
 AC_CHECK_FUNCS([gettimeofday memset socket strchr malloc])
+if test "x$WIN32" != "xyes"; then
+    AC_CHECK_LIB(rt, clock_gettime,
+        [
+            RT_LIBS="-lrt"
+            AC_SUBST(RT_LIBS)
+        ],
+        [
+            AC_MSG_ERROR([required library rt was not found on your system])
+        ]
+    )
+fi
 
 if test "x$BUILD_AV" = "xyes"; then
     AX_PTHREAD(
diff --git a/toxcore/Makefile.inc b/toxcore/Makefile.inc
index 926b4e3fa..4c9597890 100644
--- a/toxcore/Makefile.inc
+++ b/toxcore/Makefile.inc
@@ -50,6 +50,7 @@ libtoxcore_la_LDFLAGS = $(TOXCORE_LT_LDFLAGS) \
                         $(EXTRA_LT_LDFLAGS) \
                         $(LIBSODIUM_LDFLAGS) \
                         $(NACL_LDFLAGS) \
+                        $(RT_LIBS) \
                         $(WINSOCK2_LIBS)
 
 libtoxcore_la_LIBADD =  $(LIBSODIUM_LIBS) \